Output error when input isn't a number. C++

Question

I am making a function that takes a number from the user\'s input and finds the absolute value of it. I want to make it return an error if the user inputs anything other than j

Answer 1

Pass your number as a reference and return an error code. Using the function argument as an output parameter.

bool parseNumber(int &n)
{
... 
//assign to number to n
//   if number parsing is ok return true;
...
   return false; 
}

int main()
{
   int number=0;

   if(!parseNumber(number))
      std::cout << "Number parsing failed\n";
}