求助大家看看这道题我这样写为什么错啊

#include <stdio.h>
int main()
{
int typc;
scanf_s("%d",&typc);
switch (typc)
{
case 1:
printf("NO");
break;
case 2:
printf("YES");
break;
case 3:
printf("NO");
break;
case 4:
printf("YES");
break;
case 5:
printf("NO");
break;
case 6:
printf("YES");
break;
case 7:
printf("YES");
break;
}
return 0;
}