写一个c++程序分别用指针和引用作为函数参数实现交换两个整型变量的值

使用指针作为函数参数实现交换两个整型变量的值的程序如下：

#include <iostream>
using namespace std;

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main() {
    int x = 10, y = 20;
    cout << "Before swap: x = " << x << ", y = " << y << endl;
    swap(&x, &y);
    cout << "After swap: x = " << x << ", y = " << y << endl;
    return 0;
}

使用引用作为函数参数实现交换两个整型变量的值的程序如下：

#include <iostream>
using namespace std;

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

int main() {
    int x = 10, y = 20;
    cout << "Before swap: x = " << x << ", y = " << y << endl;
    swap(x, y);
    cout << "After swap: x = " << x << ", y = " << y << endl;
    return 0;
}

这两个程序的输出结果都应该为：

Before swap: x = 10, y = 20
After swap: x = 20, y = 10