可以确定0为假，1为真吗？ [英] Is it ok to assume 0 is false and 1 is true?

问题描述

我看过代码是根据int变量而不是bool评估条件的。

I've seen code where a condition is evaluated based on an int variable instead of bool.

int condition
cin >> condition;
if (!condition)
    //do something 

我知道C ++支持0为false和1为true，但这是安全代码吗？是否所有标准的C ++编译器都支持它？

I know that C++ supports that 0 is false and 1 is true, but is this safe code? Is it supported by all C++ compilers as a standard?

考虑到您可能会切换到另一种语言并发现这种代码不是

Could it also be a bad practice considering that you might switch to another language and find out that this kind of code isn't supported?

我的意思是，这是一种很好的做法吗？

I mean, is it good practice at all?

推荐答案

是的，做这个假设是安全的。该标准定义了各种原语到 bool 的隐式转换，所有数字类型基本上都表示 0 转换为 false 和任何非零值都将转换为 true 。

Yes it is safe to make that assumption. The standard defines the implicit conversion of various primitives to bool, and all the numeric types basically state that 0 converts to false and any non-zero value converts to true.

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