ios学习Day3xiawu

switch

#include <stdio.h>
 
int main(int argc, char * argv[])
{
    int i;
    scanf("%d",&i);
    switch(i)
    {
        case :
        {printf("春");
            break;
        }
        case :
        {
            printf("夏");
            break;
        }
        case :
        {
            printf("秋");
            break;
        }
 
        case :
        { printf("冬");
        }
        default:
            break;
 
}
}

多个case可以运行一个语句块

case中定义变量需要加{}；

枚举类型（enum）

1

提高程序的可读性，本质是整形，用枚举类型代表整数常量；

enum Season
 
{
spring,
summer,
autumn,
winter
}
//默认从零开始
enum Season aeason=0;
scanf（"%d,&season"）;
switch(season)
{
case spring:
{
printf("spring");
}
case summer:

{
printf("spring");
}
case autumn:
{
printf("autumn");
]

}

#include <stdio.h>
enum Season
 
{
    spring=,
    summer,
    autumn,
    winter
};
typedef enum Season myseason ;//为现有类型创建一个别名
int main(int argc, char * argv[])
{
        //默认从零开始
    myseason season=;
    scanf("%d",&season);
    switch(season)
    {
        case spring:
        {
 
            printf("spring");
            break;        }
        case summer:
 
        {
            printf("summer");
            break;
        }
        case autumn:
        {
            printf("autumn");
            break;
 
        }
            case winter:
        {
            printf("winter");
            break;
        }
            default:
        {
            printf("未知");
        }
 
}
}