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void why(int E)
{
switch(E)
{
case 1: printf("该日星期一\n");break;
case 2: printf("该日星期二\n");break;
case 3: printf("该日星期三\n");break;
case 4: printf("该日星期四\n");break;
case 5: printf("该日星期五\n");break;
case 6: printf("该日星期六\n");break;
case 7: printf("该日星期日\n");break;
}
} /*****判断输入日期是星期几*****/