Need help with this little program

[Clones]

I am beginner to c++, I want to make a program for Quadratic formula, only the positive part, but I can't make it.. I am trying this one

quadratic formula:
http://www.regentsprep.org/Regents/math/...adLe21.gif

Code:

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

void main()
{

int a,b,c,s; float x, sq;

printf("\n Enter Values For a, b & c: ");
scanf("%d %d %d",&a,&b,&c);
s=b*b-1*4*a*c;
sq=pow(s,1/2);
x=(-1*b+s)/2*a;

printf("\n Positive solution of given quadratic equation is: %f",x);

getch();

}

please do corrections in it and help me