WRITE A C PROGRAM TO CALCULATE ROOTS OF A QUADRATIC EQUATION

/* How do you write a c program to solve quadratic equation */

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

int main(){
  float a,b,c;
  float d,root1,root2;


  printf("Enter a, b and c of quadratic equation: ");
  printf("\nA : ");
  scanf("%f",&a);
  printf("\nB : ");
  scanf("%f",&b);
  printf("\nC : ");
  scanf("%f",&c);

  d = b * b - 4 * a * c;

  if(d < 0){
      printf("Roots are complex number.\n");

      printf("Roots of quadratic equation are: ");
      printf("%.3f%+.3fi",-b/(2*a),sqrt(-d)/(2*a));
      printf(", %.3f%+.3fi",-b/(2*a),-sqrt(-d)/(2*a));

      return 0;
    }
  else if(d==0){
      printf("Both roots are equal.\n");

      root1 = -b /(2* a);
      printf("Root of quadratic equation is: %.3f ",root1);

      return 0;
    }
  else{
      printf("Roots are real numbers.\n");

      root1 = ( -b + sqrt(d)) / (2* a);
      root2 = ( -b - sqrt(d)) / (2* a);
      printf("Roots of quadratic equation are: %.3f , %.3f",root1,root2);
    }

  return 0;
}

/*

OUTPUT:
Enter a, b and c of quadratic equation:
A : 2

B : -2

C : -1
Roots are real numbers.
Roots of quadratic equation are: 1.366 , -0.366
*/