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correct_cpp_int_to_word

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Correct C++ chapter 'Hello CLI'.

Goal

Write an application with 100% code coverage

Prerequisites

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

Exercise

Write a command-line interface (CLI) program that convert the number 1 to (and including 6) to their words, followed by a newline.

Fail if the user supplies no, two or more arguments

Call to `hello_cli`	Output	Exit status
`./int_to_word`	Any	1
`./int_to_word 1`	`one` (with newline)	0
`./int_to_word 2`	`two` (with newline)	0
`./int_to_word 3`	`three` (with newline)	0
`./int_to_word 4`	`four` (with newline)	0
`./int_to_word 5`	`five` (with newline)	0
`./int_to_word 6`	`six` (with newline)	0
`./int_to_word nonsense`	Any	1
`./int_to_word 1 2`	Any	1

This is the code you start with:

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char* argv[]) 
{
  if (argc != 2)
  {
    return 1;
  }
  try
  {
    const int i{std::stoi(argv[1])};
    switch (i)
    {
      case 1: std::cout << "one\n"; break;
      case 2: std::cout << "two\n"; break;
      case 3: std::cout << "three\n"; break;
      case 4: std::cout << "four\n"; break;
      case 5: std::cout << "five\n"; break;
      case 6: std::cout << "six\n"; break;
      default: throw std::invalid_argument("i must be in range [1, 6]");
    }
  }
  catch (const std::exception&)
  {
    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

External links

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