int f(int sum)
{
int year,month,day,leap;
switch(month)
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;
case 10:sum=273;break;
case 11:sum=304;break;
case 12:sum=334;break;
default:printf("data error\n");break;
}
sum=sum+day;
if(((year%100)&&(year%400))||(year%4))
leap=1;
else
leap=0;
if(leap==1&&month>2)
sum++;
return sum;
}
main()
{
int year,month,day,A,B,C,sum;
printf("input year,month,day:\n");
scanf("%d %d %d",&year,&month,&day);
A=f(sum);
B=year-1+(year-1)/4+(year-1)/400-(year-1)/100+A;
C=B%7;
switch(C)
{
case 0:printf("%d%d%d is Sunday\n",year,month,day);break;
case 1:printf("%d%d%d is Monday\n",year,month,day);break;
case 2:printf("%d%d%d is Tuesday\n",year,month,day);break;
case 3:printf("%d%d%d is Wednesday\n",year,month,day);break;
case 4:printf("%d%d%d is Thurday\n",year,month,day);break;
case 5:printf("%d%d%d is Friday\n",year,month,day);break;
case 6:printf("%d%d%d is Saturday\n",year,month,day);break;
default:printf("date error");break;
}
}
此程序为什么不正确？
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