星期

   #include <stdio.h> 
  int main() {
      int days;
      
      printf("输入一个整数: \n");
      scanf("%d",&days);
      if(days<=5&&days>=1)
          printf("学习\n");
      else if(days==7||days==6) 
          printf("休息\n");
      else
          printf("Ooops, not in 1~7\n");
      
      return 0;
  } 

来源：https://www.cnblogs.com/ras123/p/11688277.html