为什么我的If else语句不起作用？

问题描述

该程序要求输入1到12之间的数字，并打印出与输入数字相对应的月份和季节，如果用户键入的数字不是1到12之间的数字，则会显示错误消息。看起来第一个if语句可以与其对应的嵌套语句一起完美运行，但是下一个if语句将无法正常工作，请尝试使用1、2和12，该程序可以正常运行，但是它没有任何其他值，有人可以吗知道为什么会这样吗？ 这是程序...

#include <iostream>
#include <string>
using namespace  std;

int main() {

  int number;
  string season,month;

  cout << "Welcome! This program will provide the season of the year based on the month you enter,1 corresponding to January,2 for February and so on until 12 for December" << endl << endl;

  cout << "Enter a number between 1 and 12: ";
  cin >> number;

  if (number == 1 || 2 || 12)
  {
    if (number == 1)
    {
      month = "January";
      season = "winter";
    }
    else if (number == 2)
    {
      month = "February";
      season = "winter";
    }
    else if (number == 12)
    {
      month = "December";
      season = "winter";
    }
  }
  else if (number == 3 || 4 || 5)
  {
    if (number == 3)
    {
      month = "march";
      season = "spring";
    }
    else if (number == 4)
    {
      month = "April";
      season = "spring";
    }
    else if (number == 5)
    {
      month = "May";
      season = "spring";
    }
  }
  else if (number == 6 || 7 || 8 )
  {
    if (number == 6)
    {
      month = "June";
      season = "summer";
    }
    else if (number == 7)
    {
      month = "July";
      season = "summer";
    }
    else if (number == 8)
    {
      month = "August";
      season = "summer";
    }
  }
  else if (number == 9 || 10 || 11)
  {
    if (number == 9)
    {
      month = "September";
      season = "fall";
    }
    else if (number == 10)
    {
      month = "October";
      season = "fall";
    }
    else if (number == 11)
    {
      month = "November";
      season = "fall";
    }
  }
  else
  {
    cout << "You entered an ivalid value";
    return 0;
  }

  cout << "-------------------------------------------------------------" << endl;
  cout << "You entered " << number << ". " << month << " is the " << season << " season.";
  return 0;
}

解决方法

我相信||运算符对您的使用方式无效。也就是说，语句if (number == 1 || 2 || 12)可能会转换为布尔值：

number == 1

2

12

因此，对映像进行成像时，您将强制将每个值转换为布尔表示形式。不过，可能有一种更准确的解释方式。

此修复程序很可能会这样做：

if (number == 1 || number == 2 || number == 12)

等