Thread: quadratic equation

I do not understand why this program gives me wrong result, if anyone can help I would be very appriciated

Code:

#include<stdio.h>

float a,b,c;
float D; // descriminant
float root_1, root_2,sqroot;

void get_quation(void)
{
	printf("Enter numbers: a,b,c : \n");
	scanf("%f%f%f",&a,&b,&c);
}

float find_descriminant(void)
{
	
	D=b*b-4*a*c;
	return D;
}
 float absolute_value(float x)
{
	if(x<0)
		x=-x;
	return x;
}

float find_squareroot(float x)
{
	const float eplison=.00001;
	float guess=1.0;

	while(absolute_value(guess*guess-x)>=eplison)
		guess=(x/guess+guess)/2.0;

	return guess;
}




int main(void)
{

get_quation();
find_descriminant();

if(D>0)
{
	sqroot=find_squareroot(D);
		root_1=(-b+sqroot)/2*a;
		root_2=(-b-sqroot)/2*a;

	printf("Square roots is: %f and %f\n", root_1,root_2);	
}
else if (D==0)
{
	root_1=root_2=-b/2*a;
	printf("The root is: \n", root_1);
}
else
{
	printf("Roots are imaginary\n");
}

return 0;
}

Thank's in advance

Code:

Precedence is biting you.


Code:
if(D>0)
{
	sqroot=find_squareroot(D);
		root_1=(-b+sqroot)/(2*a) ;
		root_2=(-b-sqroot)/(2*a) ;

	printf("Square roots is: %f and %f\n", root_1,root_2);	
}

Thank you for your help Dino, it worked.

Sorry matsp I forgot to thank you, I very appriciate for all willingness to help us beginners.
I am glad there is forums like this one.