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#include <string>
#include <iostream>
#include <regex>
#include <exception>
 
int main()
{
    std::string line;
    int num;
    //split onto multiple lines for readability
    while((std::cout <> num) && !(is >> line)) //re-using `line` to test for extra stuff after the number
    {
        break; //done, we got what we wanted
    }
    std::cerr << "Invalid input, try again." << std::endl;
}
 

prog.cpp: In function 'int main()':
prog.cpp:11:23: error: expected primary-expression before '>' token
     while((std::cout <> num) && !(is >> line)) //re-using `line` to test for extra stuff after the number
                       ^
prog.cpp:11:35: error: 'is' was not declared in this scope
     while((std::cout <> num) && !(is >> line)) //re-using `line` to test for extra stuff after the number
                                   ^

Standard output is empty