Roots of Quadratic Equation

Input   Coefficient of quadratic equation  
Output  Roots   
complexity  O(n).  
  
Roots (a,b,c)  
1.  Initialize root1:=root2:=0.  
2.  Set cal := (sqrt((b*b)-(4*a*c)))/(2*a).  
3.  Set root1 : =  -b + cal.  
4.  Set root2 : = -b – cal.  
5.  If(root1<0 or root2<0) then print : “Imaginary roots”  
6.  Else return  
7.  end  

#include<stdio.h>
#include<conio.h>
int main()
{
    int a,b,c,d;
    float x,y;
    printf("Enter cofficients of a*x^2 , b*X^1 and c\n");
    scanf("%d%d%d",&a,&b,&c);
    d=b*b-4*a*c;
    x=(-b+sqrt(d))/2*a;
    y=(-b-sqrt(d))/2*a;
    if(d>0)
    {
           printf("Roots are real");
    }
    else if(d==0)
    {
           printf("Roots are equal");
    }
    else
    printf("Root are imagnary");
    printf("\nRoots are %.2f and %.2f ",x,y);
    return 0;
}