richelbilderbeek / correct_cpp_hello_cli

Correct C++ chapter 'Hello CLI'

correct_cpp_hello_cli

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Correct C++ chapter 'Hello CLI'.

⚠️ this course does not work until I've updated the scripts to use GitHub Actions ⚠️

Goal

• Write a command-line interface (CLI) application

Prerequisites

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

Exercise

Write a command-line interface (CLI) program that writes Hello to the screen.

If the user has supplied a command-line argument, show it, after adding a space between 'Hello' and the argument. Ignore command-line arguments beyond the first. In all cases, the output should be followed by a newline:

Call to hello_cli	Result
./hello_cli	Hello (with newline)
./hello_cli world	Hello world (with newline)
./hello_cli world i_am_ignored	Hello world (with newline)

This is the code you start with:

main(argc, argv)
{
  //Your code here
}

• See run your program with arguments if you need help on this
• argv is a container of raw strings
• argv has argc elements
• argc is never equals to zero
• If argc equals one, just show 'Hello'
• If argc equals two or more, show 'Hello', a space, and the content of argv[1]
• Use (and prefer [1]) std::cout
• Do not use std::endl [2]

External links

• Video how to do this chapter (mp4)

References

• [1] C++ Core Guidelines: SL.io.3: Prefer iostreams for I/O
• [2] C++ Core Guidelines: SL.io.50: Avoid endl