具有多变量初始化的C ++ for-loop结构 [英] C++ for-loop structure with multiple variable initialization

问题描述

在第二个for循环，我从gcc得到以下错误：

On the 2nd for-loop, I get the following error from gcc:

error: expected unqualified-id before 'int'

我不知道我缺少什么。我查看了一个for循环应该如何看起来的文档，我仍然困惑。这里有什么问题？

I'm not sure what I'm missing. I've looked over documentation for how a for-loop should look and I'm still confused. What's wrong here?

#include <iostream>
#include <vector>

int main() { 
std::vector<int> values; 

for (int i = 0; i < 20; i++) { 
  values.push_back(i); 
}   

std::cout << "Reading values from 'std::vector values'" << std::endl;
for (int i = 0, int col = 0; i < values.size(); i++, col++) {
  if (col > 10) { std::cout << std::endl; col == 0; }
  std::endl << values[i] << ' ';
  }
}

推荐答案

在之前

Try without the int before col.

for（int i = 0，col = 0; i

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