quadEq

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

int quadEq(double a, double b, double c, double* x1, double* x2){
    double d = (b * b) - 4 * a * c;

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

int main(int argc, char *argv[]){
    if(argc != 4){
        fprintf(stderr, "Invalid arguments!\n");
        return 1;
    }

    double a = atof(argv[1]);
    double b = atof(argv[2]);
    double c = atof(argv[3]);
    double x1,x2;

    if(quadEq(a,b,c,&x1,&x2) == 0){
        printf("x1 = %.2lf , x2 = %.2lf\n", x1,x2);
    }else{
        printf("No real roots");
    }
    return 0;
}