c语言几月怎么表示什么,输入年月日判断是星期几

c语言几月怎么表示什么,输入年月日判断是星期几

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#include "stdio.h"

int main(void)

{

int a,b,c,t,i=1;

printf("请输入某年某月某日格式为yy/mm/ddn");

scanf("%d/%d/%d",&a,&b,&c);

switch(b)

{

case 1:   if(c>31) printf("errorn",i=0);   else b=0; break;

case 2:   if(a%4&&c>=29) printf("errorn",i=0); else b=31; break;

case 3:   if(c>31) printf("errorn",i=0);   else b=31+28; break;

case 4:   if(c>30) printf("errorn",i=0);   else b=31+28+31; break;

case 5:   if(c>31) printf("errorn",i=0);   else b=31+28+31+30; break;

case 6:   if(c>30) printf("errorn",i=0);   else b=31+28+31+30+31; break;

case 7:   if(c>31) printf("errorn",i=0);   else b=31+28+31+30+31+30; break;

case 8:   if(c>31) printf("errorn",i=0);   else b=31+28+31+30+31+30+31; break;

case 9:   if(c>30) printf("errorn",i=0);   else b=31+28+31+30+31+30+31+31; break;

case 10: if(c>31) printf("errorn",i=0);   else b=31+28+31+30+31+30+31+31+30; break;

case 11: if(c>30) printf("errorn",i=0);   else b=31+28+31+30+31+30+31+31+30+31; break;

case 12: if(c>31) printf("errorn",i=0);   else b=31+28+31+30+31+30+31+31+30+31+30; break;

default : printf("errorn",i=0);

}

if(i)

{

t=a/4;

switch((a*365+t+b+c)%7)

{

case 1: printf("星期六"); break;

case 2: printf("星期天"); break;

case 3: printf("星期一"); break;

case 4: printf("星期二"); break;

case 5: printf("星期三"); break;

case 6: printf("星期四"); break;

case 0: printf("星期五"); break;

}

}

}

在这里我没有简化，方便大家看。