尝试了switch

#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main()
{
  int day;
  scanf("%d", &day);
  switch (day)
  {
  case 1:
  case 2:
  case 3:
  case 4:
  case 5:
      printf("工作日\n");
        break;
  case 6:
  case 7:
          printf("休息日\n");
          break;
  default:
          printf("你TM没常识吗!\n");
  }
  return 0;
}