学习c的第6天2

#include <stdio.h>

int main()

{

    float num;

    printf("请输入该生当月的消费额：\n");

    scanf("%f",&num);

    if (num>=0)

    {

        if (num==0)

        {

            printf("零消费。\n");

        }

        else

        {

            if (num>1000)

            {

                printf("高消费。\n");

            }

            else if (num>500)

            {

                printf("中等消费。\n");

            }

            else

                printf("低消费。\n");

        }

    }

    else

        printf("该生不光没有消费，反而挣了%.2f元。",fabs(num));

    return 0;

}

fabs()是绝对值函数，上面是一个if嵌套语句

#include <stdio.h>

int main()

{

    int age=50;

    char sex=‘f‘;

    if (age>=50&&sex==‘f‘)

    {

        printf("可以退休。\n");

    }

    return 0;

}

&&是与运算符，运算符的两边都得是真才是真，如果有一边为假，则为假，比如age=49；

学习c的第6天2

原文：http://www.cnblogs.com/linuxboke/p/5611801.html