QuadEq

#include "stdio.h"
#include "math.h"

int main()
{
    float a, b, c, d, x1, x2;
    printf("Input A, B, C for the quadratic equation Ax^2 + Bx + C = 0\n");
    printf("A = "); scanf("%f", &a);
    printf("B = "); scanf("%f", &b);
    printf("C = "); scanf("%f", &c);
    d=b*b-4*a*c;
    printf("d = %.2f\n", d);
    if (a==0) printf("The equation has exactly one root: x = %.2f", -c/b);
    else if (d<0)
    {
        x1=-b/(2*a);
        x2=sqrt(-d)/(2*a);
        printf("The equation has two distinct complex roots.\n");
        printf("x1 = %.2f + %.2fi\n", x1, x2);
        printf("x1 = %.2f - %.2fi", x1, x2);
    }
    else if (d==0)
    {
        printf("The equation has exactly one double root:\nx1 = x2 = %.2f", -b/(2*a));
    }
    else
    {
        x1=(-b+sqrt(d))/(2*a);
        x2=(-b-sqrt(d))/(2*a);
        printf("The equation has two distinct real roots.\nx1 = %.2f\nx2 = %.2f", x1, x2);
    }
}