C++ exchange

Sure, I can help you with that! In C++, you can exchange the values of two variables using a temporary variable. Here's an example:

#include <iostream>

void exchange(int& a, int& b) {
    int temp = a;
    a = b;
    b = temp;
}

int main() {
    int num1 = 5;
    int num2 = 10;
    
    std::cout << "Before exchange: num1 = " << num1 << ", num2 = " << num2 << std::endl;
    
    exchange(num1, num2);
    
    std::cout << "After exchange: num1 = " << num1 << ", num2 = " << num2 << std::endl;
    
    return 0;
}

In this example, the `exchange` function takes two integers by reference and swaps their values using a temporary variable. You can call this function to exchange the values of any two variables.