代码文本:
#include "stdio.h"
int main(int argc,char *argv[]){
int n;
char w[7][10]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
printf("Enter n(int 0<=n)...\nn=");
if(scanf("%d",&n)!=1 || n<0){
printf("Input error, exit...\n");
return 0;
}
printf("Today is Saturday, after %d day(s) is %s.\n",n,w[(n+6)%7]);
return 0;
}
把公式列出来就很简单了。应该是
n-6/7