C语言实例9：IF语句

#include <stdio.h>

int main(int argc, char *argv[])
{
    int x, y, z, mid, dec;
    printf("请任意输入三个整数： \n");

    scanf("%d %d %d", &x, &y, &z);

    if(x < y)
    {
        mid = x;
        x = y;
        y = mid;
    }

    if(x < z)
    {
        mid = x;
        x = z;
        z = mid;
    }

    if(y < z)
    {
        mid = y;
        y = z;
        z = mid;
    }

    printf("请输入一个整数，程序根据其正负判断输出：\n");
    scanf("%d", &dec);
    if(dec >= 0)
        printf("最大的整数为： %d", x);
    else printf("最小整数为： %d", z);

    while(1);

    return 0;
}