测试完才发现我下面代码写的不规范，那个枚举里面的几种类型必须为全部大写字母

1、非赋值的枚举类型
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#include "stdio.h"

enum weekday
{ sun,mon,tue,wed,thu,fri,sat } a,b,c;

main(){

a=sun;
b=mon;
c=tue;

enum weekday d ,e ,f;

d = wed;
e = thu;
f = fri;

printf("%d,%d,%d,%d,%d,%d\n",a,b,c,d,e,f);
}

输出：
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pateo@pateo-B86N53X:~/work/study$ cc main.c -o main
pateo@pateo-B86N53X:~/work/study$ ./main
0,1,2,3,4,5

2、赋值的起始枚举
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#include "stdio.h"

enum weekday
{ sun=0x0009,mon,tue,wed,thu,fri,sat } a,b,c;

main(){

a=sun;
b=mon;
c=tue;

enum weekday d ,e ,f;

d = wed;
e = thu;
f = fri;

printf("%d,%d,%d,%d,%d,%d\n",a,b,c,d,e,f);
}

输出：
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pateo@pateo-B86N53X:~/work/study$ cc main.c -o main
pateo@pateo-B86N53X:~/work/study$ ./main
9,10,11,12,13,14

3、赋值特殊
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#include "stdio.h"

enum weekday
{ sun=0x0009,mon,tue,wed=0x0003,thu,fri,sat } a,b,c;

main(){

a=sun;
b=mon;
c=tue;

enum weekday d ,e ,f;

d = wed;
e = thu;
f = fri;

printf("%d,%d,%d,%d,%d,%d\n",a,b,c,d,e,f);
}

输出：
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pateo@pateo-B86N53X:~/work/study$ cc main.c -o main
pateo@pateo-B86N53X:~/work/study$ ./main
9,10,11,3,4,5

4、重复特殊
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#include "stdio.h"

enum weekday
{ sun=0x0009,mon=5,tue,wed=0x0003,thu=7,fri=2,sat=9 } a,b,c;

main(){

a=sun;
b=mon;
c=tue;

enum weekday d ,e ,f ,g;

d = wed;
e = thu;
f = fri;
g = sat;

printf("%d,%d,%d,%d,%d,%d,%d\n",a,b,c,d,e,f,g);
}

输出：
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pateo@pateo-B86N53X:~/work/study$ cc main.c -o main
pateo@pateo-B86N53X:~/work/study$ ./main
9,5,6,3,7,2,9