如何正确评估此if语句

本文介绍了如何正确评估此if语句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 我正在做一个涉及生日计划中的try-catch块的家庭作业。虽然我的大部分内容已经停止，但我仍然需要使用if语句，因此程序会在少于31天的时间内正确评估。 if （（month = 4 ， 6 ， 9 ， 11 ）&&（date> 30 ）） throw invalidDay（）; 每当我尝试运行它时，它会向我抛出invalidDay（）。如果我从程序中删除它，该程序可以找到。我环顾四周但却找不到任何东西，所以我想知道是否有人可以帮助我？ 我尝试了什么： 我试过删除程序中的代码，我尝试过使用||运算符，我试过限制if语句的大小（即：month = 4&& date> 30）解决方案 你没有，因为有几个原因： 1）Equals是一个赋值运算符：你根本不应该在if语句中使用它，并且你不能为一个变量分配四个值。 2）即使您使用了比较运算符==，也可以根据四个值进行检查，它不是在此列表中运算符，而C ++没有运算符。 尝试： if （（month == 4 || month == 6 || month == 9 ||月== 11 ）&& date> 30 ） { ... I'm working on a homework assignment involving try-catch blocks in a birthday program. While I have most of it down I'm stuck at an if statement I need to use so the program evaluates properly for months that have less than 31 days.if ((month = 4, 6, 9, 11) && (date > 30))throw invalidDay();Whenever I try to run it, it throw's the invalidDay() at me. If I remove it from the program, the program works find. I looked around but couldn't really find anything so I was wondering if someone might be able to help me?What I have tried:I have tried deleting the code from the program, I have tried using the || operator, I have tried limiting the size of the if statement(ie: month = 4 && date > 30) 解决方案 You don't, for several reasons:1) Equals is an assignment operator: you shouldn't use it in an if statement at all, and you can't assign four values to a single variable.2) Even if you used the comparison operator "==", you can;t check it against four values, it isn't an "in this list" operator, and C++ doesn't have one.Try:if ((month == 4 || month == 6 || month == 9 || month == 11) && date > 30) { ... 这篇关于如何正确评估此if语句的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！