我遇到了麻烦：意思。 [英] I am having trouble with : meaning.

问题描述

在此示例中分号的含义>> for（const auto& value：1st）

what does the semicolon mean in this example >> for (const auto& value : 1st)

#include <initializer_list>
using namespace std;
int makeSum(initializer_list<int> 1st)
{  int total= 0;
for (const auto& value : 1st) { //Right here
total += value;  }
return total;  }

我尝试过：



我试着在这里一次又一次地问。

What I have tried:

I tried to ask here, again and again.

推荐答案

不再是帮助吸血鬼了。你要么学会做自己的研究，要么就是在错误的课堂上。编写代码需要你做大量的研究，如果你要在这个行业生存。



现在，再一次，这是一个COLON，而不是一个分号。



接下来，如果您使用Google搜索C ++ for const auto，您会发现您正在查看基于范围的for循环。



阅读基于范围的文档循环 [ ^ ]，你会看到冒号后的表达式应该是一个范围表达式，或者返回一系列对象的东西。这也称为列表，您需要按照makeSum函数头中的描述传入。

Stop being a help vampire. You either learn to do your own research or you're in the wrong class. Writing code requires you to do a LOT of research if you're going to survive in this business.

Now, again, that is a COLON, not a semicolon.

Next, if you would have Googled for "C++ for const auto", you would have found out that you're looking at a range-based for loop.

Reading the documentation on a range-based for loop[^], you would have seen that the expression after the colon is expected to be a "range expression", or something that returns a range of objects. This is also known as a "list", which you are expected to pass in as described in your makeSum function header.

正如戴夫所说，不再是帮助吸血鬼。转到 C ++语言参考| Microsoft Docs [ ^ ]并努力学习该语言。

As Dave says, "stop being a help vampire". Go to C++ Language Reference | Microsoft Docs[^] and make an effort to actually learn the language.

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