C语言：传值，传地址

#include <iostream>
// 交换位置
//  “值调用”
void swap_value(int x, int y) {
    int temp = x;
    x = y;
    y = temp;

}
// “引用调用1”，形参：传的是地址，取得是值(*)
void swap_p(int *x, int *y) {
    int temp = *x;
    *x = *y;
    *y = temp;
}
// “引用调用2”，形参：传的是值，接的是地址
void swap_addr(int &a, int &b) {
    int temp = a;
    a = b;
    b = temp;
}
main() {
    int x = 0;
    int y = 1;
    printf("x = %d, y = %d\n", x, y);

    swap_value(x, y);
    printf("传值调用后：x = %d, y = %d\n", x, y);

    swap_p(&x, &y);
    printf("传地址调用后：x = %d, y = %d\n", x, y);

    swap_addr(x, y);
    printf("传值接地址调用后：x = %d, y = %d\n", x, y);
}

x = 0, y = 1
传值调用后：x = 0, y = 1
传地址调用后：x = 1, y = 0
传值接地址调用后：x = 0, y = 1