Using - C
  
 Source Code
  

    
      #include<stdio.h>

      void Swap(int *a, int *b);

      void main() {
        int a, b;
        printf("Enter the value of a:  ");
        scanf("%d",&a);
        printf("Enter the value of b:  ");
        scanf("%d",&b);
        system("cls");
        
        printf("Before Swapping:  a = %d   &   b = %d",a,b);
        Swap(&a,&b);
        printf("\nAfter Swapping :  a = %d   &   b = %d",a,b);
      }
       
      void Swap(int *a, int *b) {
      int temp = *a;
          *a = *b;
          *b = temp;
      }
    

Enter the value of a:   9
Enter the value of b:   3 
-------------------------------------------------
Before Swapping:  a = 9   &   b = 3
After Swapping   :  a = 3   &   b = 9

        
Using - C++
        
 Source Code
        

        
            #include<iostream>
            using namespace std;

            class Swapper {
              public: 
                void Swap(int *a, int *b);
            };
            
            void Swapper::Swap(int *a, int *b) {
            int temp = *a;
                *a = *b;
                *b = temp;
            }
            
            int main() {
            int a, b;
            Swapper object;
              cout<< "Enter the value of a:  ";
              cin>> a;
              cout<< "Enter the value of b:  ";
              cin>> b;
              system("cls");
              
              cout<< "Before Swapping:  a = "<< a<< "  &  b = "<< b<< endl;
              object.Swap(&a,&b);
              cout<< "After Swapping :  a = "<< a<< "  &  b = "<< b<< endl;
                  
              return 0;
            }
      

Enter the value of a:   10
Enter the value of b:   17 
-------------------------------------------------
Before Swapping:  a = 10   &   b = 17
After Swapping   :  a = 17   &   b = 10