ex2

#include <stdio.h>
  int main() {
      int days;

      printf("输入一个整数: \n");
      scanf("%d",&days);

      // 补足×××处的表达式，使得满足程序功能描述
      if(days<=) // days在1到5之间
          printf("workdays, fighting\n");
      else if(days=&) // days是6或7
          printf("weekend, relax~\n");
      else
          printf("Ooops, not in 1~7\n");

      return ;
  }