程序代码：

#include<stdio.h>
void swap(int *p1, int *p2)
{
    int *t;
    t = p1;
    p1 = p2;
    p2 = t;
}

int main()
{
    void swap(int *p1, int *p2);
    int a, b;
    int *x1 = &a, *x2 = &b;
    scanf_s("%d%d", &a, &b);
    if (a < b)
        swap(x1, x2);
    printf("%d %d\n", *x1, *x2);
    return 0;
}

程序代码：

#include<stdio.h>
void swap(int *p1, int *p2)
{
    int *t;
    t = p1;
    p1 = p2;
    p2 = t;
    printf("%d %d\n", *p1, *p2);
}

int main()
{
    void swap(int *p1, int *p2);
    int a, b;
    int *x1, *x2;
    scanf_s("%d%d", &a, &b);
    x1 = &a;
    x2 = &b;
    if (a < b)
        swap(x1, x2);
    return 0;
}

程序代码：

#include<stdio.h>
int *p1, *p2;
void swap()
{
    int *t;
    t = p1;
    p1 = p2;
    p2 = t;
    
}

int main()
{
    void swap();
    int a, b;
    scanf_s("%d%d", &a, &b);
    p1 = &a;
    p2 = &b;
    if (a < b)
        swap();
    printf("%d %d\n", *p1, *p2);
    return 0;
}

[此贴子已经被作者于2017-1-8 17:03编辑过]

程序代码：

void change(int x, int y)
{
    int t;
    t = x;
    x = y;
    y = t;
}

#include<stdio.h>
int main()
{
    void change(int x, int y);
    int a = 1, b = 3;
    if (a < b)
        change(a, b);
    printf("%d %d\n", a, b);
    return 0;
}