Thread: while loops...a problem with my simple code?

I think there may be a problem with my usage of brackets below.
Any ideas on this simple program to find roots of quadratic equation?

many thanks!

include

Code:

#include <stdio.h> 
#include <stdlib.h> 
#include <math.h> 
int main()

{
char answer;
int a,b,c;
float single_root, root_part1, root_part2;//declaring function variables these 
                                          //being different elements of the 
                                          //quadratic formula
float root1, root2;
int is_complex;

do

printf("Enter coeficients a b c: ");
scanf("&#37;f %f %f", &a, &b, &c);

is_complex = 0;   //(is_complex) function = 0 if a=0
   
   if (a==0)
   {
   single_root=-1.0*c/b;//stating variables
   }
   
   else
   
   {
   root_part1 = -1.0*b/(2.0*a); //stating variables
   root_part2= b*b-4.0*a*c;
   
      if (root_part2<0.0)
      {
                         
      is_complex = 1; 
      
      root_part2= -1.0*root_part2;//remember this is not equal to, 
                                  //this is a directive
      }
      
            
       root_part2=sqrt(root_part2)/(2.0*a);
            
       }
            
        if(a==0.0)
            
       {
        Printf("single_root = %f\n ", single_root);//single root case
       }
            
        else if  (is_complex==1)
               
       {
       printf("root 1 = %.2f+%.2f i\n", root_part1, root_part2); 
       printf("root 1 = %.2f-%.2f i\n", root_part1, root_part2);
       }
               
       else 
               
       {
       root1= root_part1+root_part2;  
       root2= root_part1-root_part2;
               
   printf("root1 = %.2f", root1);
   printf("root2 = %.2f", root2);
   }
               
   {
   printf("enter next set of coefficients (y/n): ");
   scanf(" %c", &answer);
   }

           
   while (answer != 'n' && answer != 'N'); 
           
   scanf("d\n");   
   exit(0);
   
}