correct_cpp_is_even

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Correct C++ chapter 'is even'.

Goals

• First use of std::regex

Prerequisites

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

Exercise

Write a command-line interface (CLI) program that determines if its argument is an even number.

If there are more arguments supplied, exit the program.

Call to is_even	Output	Exit status
./is_even	Any	1
./is_even 12345678901234567890	true (with newline)	0
./is_even 12345678901234567891	false (with newline)	0
./is_even nonsense	Any	1
./is_even 2 1	Any	1

This is the code you start with:

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

• You cannot use std::stoi, as it will not convert 12345678901234567890 to integer
• Instead, you should use std::regex
• An even number is a regular expression of one or more digits, that may or may not start with a minus

External links

• [none]