Tinkering on verifying a stream of spaces, letter and punctuations

[lokdon]

#include <iostream>
#include <cctype>
#include <string>

std::string getLetters()
{
    std::string input;
    bool valid;

    do
    {
std::cout<<"\n Enter you name of the experiment:";       
std::getline(std::cin,input);       // get a line of input

        valid = true;                       // assume it's valid
        for(auto& i : input)                // check each character in the input string
        {
            if(!std::isalpha(i))            // is it an alphabetical character?
            {
                valid = false;              // if not, mark it as invalid
                                    // print an error to the user
                std::cout << "Invalid input.  Please input only alphabetical characters." << std::endl;
                break;              // break out of the for() loop, as we have already established the input is invalid
            }
        }
    }while(!valid);     // keep going until we get input that's valid

    return input;       // once we have valid input, return it
}

The code above is not working when I run it. It terminates with a screen shot below. I am using code::block13.12 for compiler.

[2kaud]

[Thread moved as not c++/cli]

[2kaud]

How are calling/using getLetters() as this works OK with VS2017.

#include <iostream>
#include <cctype>
#include <string>

std::string getLetters()
{
	std::string input;
	bool valid;

	do
	{
		std::cout << "\n Enter you name of the experiment:";
		std::getline(std::cin, input);       // get a line of input

		valid = true;                       // assume it's valid
		for (auto& i : input)                // check each character in the input string
		{
			if (!std::isalpha(i))            // is it an alphabetical character?
			{
				valid = false;              // if not, mark it as invalid
											// print an error to the user
				std::cout << "Invalid input.  Please input only alphabetical characters." << std::endl;
				break;              // break out of the for() loop, as we have already established the input is invalid
			}
		}
	} while (!valid);     // keep going until we get input that's valid

	return input;       // once we have valid input, return it
}

int main()
{
	std::cout << getLetters() << std::endl;
}