g ++错误:"vec"未命名类型 [英] g++ error: ‘vec’ does not name a type

问题描述

我正在尝试使用C ++ STL向量.这是我的程序:

I'm trying to work with C++ STL vectors. Here is my program:

# include <iostream> 
# include <vector>

using namespace std; 

vector<int> vec; 

vec.push_back(10);
vec.push_back(5);
vec.push_back(1);

vector<int>::iterator itr1 = vec.begin();
vector<int>::iterator itr2 = vec.end();

for(vector<int>::iterator itr = itr1; itr != itr2; itr++){
    cout << *itr  << endl;  
}

我收到错误 error:在 vec.push_back(); 行上，"vec"没有命名类型.我看不到我在做什么错.

I get the error error: ‘vec’ does not name a type on the lines vec.push_back();. I'm unable to see what I'm doing wrong here.

推荐答案

仅在函数内部允许使用诸如 vec.push_back(42); 之类的语句.例如，

Statements such as vec.push_back(42); are only allowed inside of functions. For example,

#include <iostream> 
#include <vector>

int main()
{
  using namespace std; 

  vector<int> vec; 

  vec.push_back(10);
  vec.push_back(5);
  vec.push_back(1);

  vector<int>::iterator itr1 = vec.begin();
  vector<int>::iterator itr2 = vec.end();

  for(vector<int>::iterator itr = itr1; itr != itr2; itr++){
    cout << *itr  << endl;  
  }

}

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