错误:'i' 没有用 auto 命名类型

error: ‘i’ does not name a type with auto(错误:i 没有用 auto 命名类型)

问题描述

我是 C++ 新手，这是我的程序

I am new to C++,here is my program

#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <functional>  

int main(){

static const double arr[] = {16.0,2.2,77.5,29.0,24.0};
std::vector<double> vec (arr, arr + sizeof(arr) / sizeof(arr[0]) );

std::transform(vec.begin(), vec.end(), vec.begin(),bind2nd(std::minus<double>(), 3.0)); 

for (auto i = vec.begin(); i != vec.end(); ++i)
    std::cout << *i << ' ';

}

当我尝试用 g++ p1.cpp -o p1 编译时

When I try to compile with g++ p1.cpp -o p1

p1.cpp: In function ‘int main()’:
p1.cpp:14:11: error: ‘i’ does not name a type
 for (auto i = vec.begin(); i != vec.end(); ++i)

我知道有更多的方法可以打印矢量，但为什么这不起作用?

I know that there more ways to print the vector,but why is this not working?

推荐答案

你应该试试 -std=c++11 .之后工作正常.

You should try with -std=c++11 . Works fine after that.

./p1
13 -0.8 74.5 26 21 

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