// header files
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

// local constants
#define QUADRATIC_A 2
#define QUADRATIC_B -4
#define QUADRATIC_C -3

/*
Name: Quadratic Formula Root Finder
Process: 
Function input/parameters: NONE
Function output/parameters: NONE
Function output/returned: NONE
Device input/---: NONE
Device output/---: NONE
Dependencies: included by standard libraries
*/
int main()
{
    // define local variables
    double positiveRoot, negativeRoot;
    // do calculations
    positiveRoot = (-QUADRATIC_B + sqrt((QUADRATIC_B * QUADRATIC_B) - 
                            (4 * QUADRATIC_A * QUADRATIC_C))) / (2*QUADRATIC_A);
    negativeRoot = (-QUADRATIC_B - sqrt((QUADRATIC_B * QUADRATIC_B) - 
                            (4 * QUADRATIC_A * QUADRATIC_C))) / (2*QUADRATIC_A);
    // display results
    printf("The roots of the quadratic %dx^2 + %dx + %d are: %f & %f.\n", 
           QUADRATIC_A, QUADRATIC_B, QUADRATIC_C, positiveRoot, negativeRoot);
    // return success
    return 0;
}