Eq ref

#include <stdio.h>
#include <conio.h>
#include <math.h>

int raizes (float a, float b, float c, float * x1, float * x2);

int main()
{
    float a, b, c, r1, r2;
    int num;

    scanf("%f %f %f", &a, &b, &c);

    num = raizes(a, b, c, &r1, &r2);

    if(num == 0)
        printf("Nenhuma raiz real\n");
    else if(num == 1)
    {
        printf("X1 = X2 = %f\n", r1);
    }
    else
    {
        printf("X1 = %f\n", r1);
        printf("X2 = %f\n", r2);
    }

    getch();
}

int raizes(float a, float b, float c, float * x1, float * x2)
{
    float delta = pow(b, 2) - 4 * a * c;

    if(delta < 0)
        return 0;
    else if(delta == 0)
    {
        *x1 = (b * -1 + sqrt(delta)) / (2 * a);
        return 1;
    }
    else
    {
        *x1 = (b * -1 + sqrt(delta)) / (2 * a);
        *x2 = (b * -1 - sqrt(delta)) / (2 * a);
        return 2;
    }
}