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7th May 2018 Update
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‎CJC-Programming/first.c

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<stdio.h>
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int main()
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{
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printf("Hello wsdgcvhbnm,mnbvcxvbnmorld\n");
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return 0;
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}

‎CJC-Programming/plus.c

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<stdio.h>
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int main()
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{
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int a,b;
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a=20
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b=5;
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printf("%d",a+b);
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return 0;
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}

‎CJC-Programming/s.c

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include <stdio.h>
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int main() {
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printf("Hello World");
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}

‎CJC-Programming/strProcess.c

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<stdio.h>
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int main ()
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{
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char s[100],u[100];
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while(1){
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scanf("%s",&s);
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//printf("%s",s);
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if(s[0] == '#')
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return 0;
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int i,l;
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l=strlen(s);
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for(i=0;i<l;i++)
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{
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if(s[i]>='a' && s[i]<='z')
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u[i]=s[i]-'a'+'A';
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else
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u[i]=s[i]-'A'+'a';
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}
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u[i]=s[i];
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printf("%s\n",u);
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}
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return 0;
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}

‎CJC-Programming/wtcjc.c

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include <stdio.h>
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int main( )
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{
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printf("Welcome to CJC");
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return 0;
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}

‎Numerical Method/codeofimran1.cpp

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<bits/stdc++.h>
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using namespace std;
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#define ll int
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ll save;
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ll myfunction(ll number)
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{
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if(number==0||number==1)
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{
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return number;
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}
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ll start=1;
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ll endd=number;
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while(start<=endd)
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{
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ll mid=(start+endd)/2;
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if(mid*mid==number)
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{
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return mid;
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}
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if(mid*mid<number)
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{
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start=mid+1;
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save=mid;
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}
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else
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{
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endd=mid-1;
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}
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}
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return save;
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}
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int main()
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{
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ll number;
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while(1)
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{
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ll number,save,save2,minn,maxx,mid;
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cout<<"Enter a Number to find its floorsqrt()\t(-1 to exit)\n";
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cin>>number;
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if(number==-1)break;
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cout<<"floorsqrt() of the number is "<<myfunction(number)<<endl<<endl;
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}
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return 0;
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}

‎Numerical Method/codeofshafee1.cpp

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<bits/stdc++.h>
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#define MD 1000000007
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#define ll long long
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using namespace std;
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double fun_fx(double x)
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{
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double fx=(x*x*x)+(5*x)-10;
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return fx;
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}
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int main()
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{
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cout<<"\t\t\tBisection method algorithm implementation\n\nfunction f(x)=x^3+5x-10\n";
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double a,b;
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while(1)
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{
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cout<<"Enter a and b such as a<b and f(a)*f(b)<0\n";
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cin>>a>>b;
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double mul=fun_fx(a)*fun_fx(b);
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if(a<b && mul<0)
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{
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break;
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}
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else
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{
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cout<<"given a and b not valid! try again :(\n\n";
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}
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}
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double eps;
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cout<<"Enter specific tolerance: ";
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cin>>eps;
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ll i=1;
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double mid=(a+b)/2.0;
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printf(" i\t a\t\tx(mid)\t\tb\t\tf(a)\t\tf(x(mid))\tf(b)\n");
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cout<<"---------------------------------------------------------------------------------------------------------\n";
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while(fabs(b-mid)>=eps)
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{
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printf("%2lld\t%lf\t%lf\t%lf\t%lf\t%lf\t%lf\n",i,a,mid,b,fun_fx(a),fun_fx(mid),fun_fx(b));
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if(fun_fx(mid)*fun_fx(b)<0)
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{
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a=mid;
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}
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else if(fun_fx(a)*fun_fx(mid)<0)
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{
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b=mid;
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}
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mid=(a+b)/2.0;
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i++;
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}
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cout<<"Error: "<<fabs(b-mid)<<endl;
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return 0;
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}

‎Numerical Method/codeofuk1.cpp

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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#include<iostream>
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#include<cmath>
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#include<iomanip>
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using namespace std;
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double f(double x);
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double f(double x)
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{
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double a=pow(x,3)-x-11.0;
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return a;
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}
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int main()
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{
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cout.precision(4);
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cout.setf(ios::fixed);
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double a,b,c,e,fa,fb,fc;
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a:cout<<"Enter the initial guesses:\na=";
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cin>>a;
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cout<<"\nb=";
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cin>>b;
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cout<<"\nEnter the degree of accuracy desired"<<endl;
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cin>>e;
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if (f(a)*f(b)>0)
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{
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cout<<"Please enter a different initial guess"<<endl;
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goto a;
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}
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else
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{
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while (fabs(a-b)>=e)
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{
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c=(a+b)/2.0;
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fa=f(a);
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fb=f(b);
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fc=f(c);
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cout<<"a="<<a<<" "<<"b="<<b<<" "<<"c="<<c<<" fc="<<fc<<endl;
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if (fc==0)
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{
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cout<<"The root of the equation is "<<c;
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break;
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}
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if (fa*fc>0)
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{
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a=c;
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}
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else if (fa*fc<0)
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{
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b=c;
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}
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}
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}
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cout<<"The root of the equation is "<<c;
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return 0;
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}
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‎Numerical Method/lab1.cpp

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/************************************************************************/
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/* Name: Towfiqul Islam */
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/* uva id: 448714 */
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/* email id: towfiq.106@gmail.com */
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/* institute: IIUC */
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/* address: Chittagong, Bangladesh */
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/* */
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/************************************************************************/
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/****
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Lab 1: Implementation of Bisection method
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Course name: Numerical Methods Sessional
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Course code: CSE-3608
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Submitted to:
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Md. Sabir Hossain
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Dept. of CSE,
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CUET
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Submitted by:
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Towfiqul Islam
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ID: C141018
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Section: 6AM
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6th semester, Dept of CSE, IIUC
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Date of Submission: 07/11/16
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*******/
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/***
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Implementation of Bisection method algorithm
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C++ code:
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****/
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#include<bits/stdc++.h>
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#include<iostream>
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#include<cmath>
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#include<iomanip>
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using namespace std;
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double f(double x) //define the function here, ie give the equation
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{
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double a=pow(x,3)-x-11.0; //write the equation whose roots are to be determined
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return a;
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}
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int main()
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{
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cout.precision(4); //set the precision
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cout.setf(ios::fixed);
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double a,b,c,e,fa,fb,fc; //declare some needed variables
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a:cout<<"Enter the initial guesses:\na="; //Enter the value of a(set a label('a:') for later use with goto)
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cin>>a;
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cout<<"\nb="; //Enter the value of b
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cin>>b;
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cout<<"\nEnter the degree of accuracy desired"<<endl; //Enter the accuracy
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cin>>e; //e stands for accuracy
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if (f(a)*f(b)>0) //Check if a root exists between a and b
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{ //If f(a)*f(b)>0 then the root does not exist between a and b
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cout<<"Please enter a different intial guess"<<endl;
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goto a; //go back to 'a' ie 17 and ask for different values of a and b
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}
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else //else a root exists between a and b
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{
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while (fabs(a-b)>=e) /*if the mod of a-b is greater than the accuracy desired keep bisecting the interval*/
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{
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c=(a+b)/2.0; //bisect the interval and find the value of c
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fa=f(a);
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fb=f(b);
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fc=f(c);
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cout<<"a="<<a<<" "<<"b="<<b<<" "<<"c="<<c<<" fc="<<fc<<endl;
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/*print the values of a,b,c and fc after each iteration*/
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if (fc==0) //if f(c)=0, that means we have found the root of the equation
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{
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cout<<"The root of the equation is "<<c; /*print the root of the equation and break out of the loop*/
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break;
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}
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if (fa*fc>0) //if f(a)xf(c)>0, that means no root exist between a and c
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{
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a=c; /*hence make a=c, ie make c the starting point of the interval and b the end point*/
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}
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else if (fa*fc<0)
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{
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b=c; /*this means that a root exist between a and c therfore make c the end point of the interval*/
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}
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}
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} /**The loop ends when the difference between a and b becomes less than the desired accuracy
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ie now the value stored in 'c' can be called the approximate root of the equation **/
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cout<<"The root of the equation is "<<c; //print the root
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return 0;
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}
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//output attached as jpg

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