OR-tut3-zad3

#include <stdio.h>
#include <math.h>
int main()
{
    float a, b, c;
    float x1_re, x1_im;
    float x2_re, x2_im;
    float t, D;
    printf("Unesite koeficijente kvadratne jednacine: ");
    scanf("%f %f %f", &a, &b, &c);
    D = b * b - 4.0f * a * c;

    while (D<0) {
            printf("D je manje od 0. Unesite ponovo:");
      scanf("%f %f %f", &a, &b, &c);
         D = b * b - 4.0f * a * c;

    }
     printf("Rjesenja su: \n");
    if(D > 0.0f)
    {
        t = sqrt(D);
        x1_re = (- b + t) / (2 * a);
        x2_re = (- b - t) / (2 * a);
        printf(" x1 = %f \n", x1_re);
        printf(" x2 = %f \n", x2_re);
    }
    else if(D == 0.0f)
    {
        x1_re = - b / (2 * a);
        printf(" x1 = x2 = %f \n", x1_re);
    }

    return 0;
}