Find the Roots of a Quadratic Equation

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

int main() {
 float a, b, c, determinant, r1,r2, real, imag; 

 printf("Enter coefficients a, b and c: ");
 scanf("%f%f%f",&a,&b,&c); 

 determinant=b*b-4*a*c; 
 if (determinant>0) { 
  r1= (-b+sqrt(determinant))/(2*a);
  r2= (-b-sqrt(determinant))/(2*a);
  printf("Roots are: %.2f and %.2f",r1 , r2);
 }
 else if (determinant==0) {
  r1 = r2 = -b/(2*a); 
  printf("Roots are: %.2f and %.2f", r1, r2);
 } else { 
  real= -b/(2*a);
  imag = sqrt(-determinant)/(2*a);
  printf("Roots are: %.2f+%.2fi and %.2f-%.2fi", real, imag, real, imag); 
 } 
 return 0;
} 

/*
Summary: Finds roots of a quadratic equation ax2+bx+c=0 where a, b and c are coefficients. This program will ask the coefficients: a, b and c from user and displays the roots.
*/