W3School TIY Editor

#include <iostream> using namespace std; void swapNums(int &x, int &y) { int z = x; x = y; y = z; } int main() { int firstNum = 10; int secondNum = 20; cout << "交换前: " << "\n"; cout << firstNum << secondNum << "\n"; swapNums(firstNum, secondNum); cout << "交换后: " << "\n"; cout << firstNum << secondNum << "\n"; return 0; }