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ios学习Day3xiawu

switch

#include <stdio.h>int main(int argc, char * argv[]){    int i;    scanf("%d",&i);    switch(i)    {        case 1:        {printf("");            break;        }        case 2:        {            printf("");            break;        }        case 3:        {            printf("");            break;        }                    case 4:        { printf("");        }        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=1,    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=0;    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");        }            }}