为什么以下代码适用于在线ide（gcc 7.2.0）但在ubuntu上出错？

Question

当我在ubuntu上运行以下代码时（gcc（Ubuntu 5.4.0-6ubuntu1~16.04.4））：

#include<iostream>
#include<vector>
#include<list>
using namespace std;
int main(){
vector <int> v;
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(5);
list<int> temp;
for(auto i:v){
    cout<<i<<" ";
    temp.push_back(i);
}
for(auto i:temp){
    cout<<i<<" ";
}
}

我收到以下错误：

try.cpp: In function ‘int main()’:
try.cpp:13:10: error: ‘i’ does not name a type
 for(auto i:v){
          ^
try.cpp:17:1: error: expected ‘;’ before ‘for’
 for(auto i:temp){
 ^
try.cpp:17:1: error: expected primary-expression before ‘for’
try.cpp:17:1: error: expected ‘;’ before ‘for’
try.cpp:17:1: error: expected primary-expression before ‘for’
try.cpp:17:1: error: expected ‘)’ before ‘for’
try.cpp:17:10: error: ‘i’ does not name a type
 for(auto i:temp){
          ^
try.cpp:20:1: error: expected ‘;’ before ‘}’ token
 }
 ^
try.cpp:20:1: error: expected primary-expression before ‘}’ token
try.cpp:20:1: error: expected ‘;’ before ‘}’ token
try.cpp:20:1: error: expected primary-expression before ‘}’ token
try.cpp:20:1: error: expected ‘)’ before ‘}’ token
try.cpp:20:1: error: expected primary-expression before ‘}’ token

但是当我在网上运行代码时，我的工作正常 代码有什么问题？
在线ide的代码链接：No errors

Answer 1

您的代码使用了一些C ++ 11功能，例如range based loops和auto specifier，但您不需要编译C ++ 11标准。您需要通过在编译时包含-std=c++11标志来启用C ++ 11支持：

g++ -std=c++11 -o try try.cpp

在线编译器使用-std=gnu++1z标志启用了此功能。