C++ program to swap two numbers using call by reference
Last updated:4th Sep 2022
In this example, we will write a c++ program to swap two numbers entered by the user by using the call by reference method.
input: a = 5 b = 10 output: a = 10 b = 5
#include<iostream>
using namespace std;
// Function Prototype
void swapnumber(int * , int * );
int main() {
int a, b;
cout << "Enter Two Numbers: ";
cin >> a >> b;
printf("before swapping: a=%d b=%d\n", a, b);
// Pass reference
swapnumber( &a, &b);
printf("After swapping: a=%d b=%d\n", a, b);
return 0;
}
/* Function to swap two variables by reference */
void swapnumber(int *x, int *y) {
int t;
t = *x;
*x = *y;
*y = t;
}
output
Enter Two Numbers: 5 10 before swapping: a=5 b=10 After swapping: a=10 b=5
