Local and global variable, block level scope example

Author: georgecatalin

Learn_CPP_Programming_Deep_Dive/Section 10 Functions/Local_global_scope/main.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+
+using namespace std;
+
+int global_var = 12;
+
+void fun()
+{
+    int local_var = 45;
+    cout<<"Local variable "<<local_var<<endl;
+
+    global_var++;
+    cout<<"The global variable is "<<global_var<<endl; //13
+}
+
+int main(void)
+{
+        cout<<"The global variable is "<<global_var<<endl; //12
+        fun();
+        cout<<"The global variable is "<<global_var<<endl; //13
+
+        return 0;
+}

Learn_CPP_Programming_Deep_Dive/Section 10 Functions/Local_scope/main.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+
+using namespace std;
+
+int my_var = 45;
+
+int main(void)
+{
+    int my_var = 70;
+
+    {
+        int my_var = 69;
+        cout<<my_var<<endl; //69
+    }
+
+    cout<<my_var<<endl; // 70
+
+    cout<<::my_var<<endl; // 45
+    return 0;
+}

Learn_CPP_Programming_Deep_Dive/Section 10 Functions/Return_by_reference/main.cpp

@@ -8,11 +8,21 @@ int & fun(int &a)
    return a;
 }
 
+int fun1(int b)
+{
+
+    return 2*b;
+}
+
 int main(void)
 {
     int x = 1953;
 
     fun(x) = 1954;
 
+    int y = fun1(3);
+    cout<<"The value of y is "<<y<<endl;
+
+
     cout<<"The value of x is "<<x<<endl;
 }