Quadratic equation solver

This program finds real roots of a given second-degree polynomial, solving equations $ax^2 + bx + c = 0$ given the coefficients $a$, $b$ and $c$.

Installation

For installation info, read here

Non-interactive mode

Coefficients can be provided via command-line arguments:

quad <a> <b> <c>

Upon receiving invalid values (letters, Inf, -Inf, NaN) or incorrect number of values the program will terminate with exit code 1.

Interactive mode

If no command-line arguments are provided, the program will launch in interactive mode:

quad
This program solves equations ax^2 + bx + c = 0
Please, enter coefficients a, b and c

Program will prompt the user to enter three floating-point numbers. As long as invalid values are provided, the program will repeatedly ask user for valid input. Upon receiving end-of-file signal, the program will stop its execution.

Getting help

Help message is provided whenever program terminates abnormally due to invalid input. User can manually get help message, using flag -h or --help

quad --help
Usage:
    quad - to launch program in interactive mode
    quad <a> <b> <c> - to get roots of an equation ax^2 + bx + c = 0
    quad -h - to get this message