How to use for each loop in c++

Question

#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

int main() {
    string str("hello world!");
    for (auto &c : str)
        c = toupper(c);
    cout << str;
    return 0;
}

This c++ code does not compile. Error msg: main.cpp:21: error: a function-definition is not allowed here before ':' token Question: Is there a for each loop in c++ (range for loop?)? what is wrong with the for each loop above?

Thanks in advance.

Answer 1

The code is valid, as can be demonstrated on an online compiler.

Please refer to your compiler documentation to be sure you have enabled C++11. The option is often called -std=c++11. You might have to download an upgrade; check your package manager for GCC (currently at 4.8) or Clang (currently 3.3).