calling by reference c++
#include <iostream>
void swap(int &a, int &b);
int main() {
int num1 = 5, num2 = 10;
std::cout << "Before swapping: num1 = " << num1 << ", num2 = " << num2 << std::endl;
swap(num1, num2);
std::cout << "After swapping: num1 = " << num1 << ", num2 = " << num2 << std::endl;
return 0;
}
void swap(int &a, int &b) {
int temp = a;
a = b;
b = temp;
}