如题所述
#include "stdio.h"
int main()
{ int w;
char week[7][3]={"日","一","二","三","四","五","六"};
printf("请输入今天是星期几(星期日用0表示):");
scanf("%d",&w);
w=(w+90)%7;
printf("90天以后是星期%s\n",week[w]);
return 0;
}