C++不使用临时变量交换两个数字

C++不使用临时变量交换两个数字

// swap two numbers without using a temporary variable
// the numbers can be either integers or floats
#include <iostream>
using namespace std;
int main()
{
    float a = 1.7;
    float b = -7.1;
    
    cout << "a = " << a << "   b = " << b << endl; 
    // swap a with b
    a = a + b;
    b = a - b;
    a = a - b;
    cout << "after swapping a with b:" << endl;
    cout << "a = " << a << "   b = " << b << endl; 
    
    cin.get();   // wait
    return EXIT_SUCCESS;
}