error: ‘i’ does not name a type with auto [duplicate]

问题:

This question already has an answer here:

• How do I enable C++11 in gcc? 3 answers

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 << ' ';  }

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)

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

回答1:

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

./p1 13 -0.8 74.5 26 21 

回答2:

Or if your compiler does not support c++11, use std::vector<double>::iterator instead of auto.

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