Hi...I 'am new in C and I want a program that solves a quadratic equation!!

I try something by my self to write some code about that but I want you to help me writing a new one that will work!!

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

int main(void)

{

float a,b,c,d,root1,root2;

printf("Welcome
...