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Correct C++ chapter 'Hello CLI'.

• Write an application with 100% code coverage

• Understand how this course works
• Have written a correct 'is_odd' program

Write a command-line interface (CLI) program that converts a boolean (true or false) to a coin's side (heads or tails respectively), followed by a newline. Fail if the user supplies no, two or more arguments.

This is the code you start with:

#include <iostream>
#include <string>

int main(int argc, char* argv[]) 
{
  if (argc != 2) 
  {
    return 1;
  }
  if (std::string(argv[1]) == "true") 
  { 
    std::cout << "heads\n";   
  }
  else if (std::string(argv[1]) == "false") 
  { 
    std::cout << "tails\n"; 
  }
  else 
  {
    return 1;
  }
}

• Your code needs to have 100% code coverage, regardless how it is called (that is, with zero, one or more arguments), see how to get 100 percent code coverage

• [none]