C语言-枚举类型

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枚举类型

相关知识

1.不能直接对枚举变量赋整数值，需要将整数强制性转换

定义枚举类型和声明枚举变量

先定义枚举类型，在定义枚举变量

# include <stdio.h>

int main(){
enum Weekday{mon,tue,wed,thu,fri,sat,sun}; // 枚举元素(枚举常量)的值从0开始
enum Weekday workday;
workday=sun; //workday=6
return 0;
}

定义枚举类型的同时，声明枚举变量

# include <stdio.h>

int main(){
enum Weekday{mon,tue,wed=5,thu,fri,sat,sun} workday; // 枚举元素(枚举常量)的值从0开始依次以1递增,第三个从5开始以1递增
workday=sun; //workday=9
return 0;
}

不定义枚举类型，直接定义枚举变量

# include <stdio.h>

int main(){
enum {mon,tue,wed,thu,fri,sat,sun} workday; // 枚举元素(枚举常量)的值从0开始
workday=sun; //workday=6
return 0;
}

枚举元素连续的枚举变量可以遍历

# include <stdio.h>

int main(){
enum {mon,tue,wed,thu,fri,sat,sun} workday; // 枚举元素(枚举常量)的值从0开始
for(workday=mon;workday<=sun;day++){
printf("%d", workday);
}
return 0;
}

在switch中的使用

#include <stdio.h>
int main(){
    enum color{red,green,blue} favorite_color;
    scanf("%d",&favorite_color); // 但不能：favorite_color=1
    switch(favorite_color){
        case red:
            break;
        case green:
            break;
        case blue:
            break;
    }
    return 0;
}

将整型转换成枚举

#include <stdio.h>
int main(){
    enum color{red,green,blue} favorite_color;
    //scanf("%d",&favorite_color);
    favorite_color=(enum color) 0;
    switch(favorite_color){
        case red:
        	printf("xxx");
            break;
        case green:
            break;
        case blue:
            break;
    }
    return 0;
}

用枚举元素作判断

#include <stdio.h>
int main(){
    enum color{red,green,blue} favorite_color;
    //scanf("%d",&favorite_color);
    favorite_color=blue;
    if(favorite_color>red){ //0
		printf(">");
    }
    return 0;
}

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