Question

C progran to find solution of quadratic polynominal equation

Answer 1

#include <stdio.h>

#include <math.h>

 

int main()

{

  int a, b, c, d;

  double root1, root2;

 

  printf("Enter a, b and c where a*x*x + b*x + c = 0\n");

  scanf("%d%d%d", &a, &b, &c);

 

  d = b*b - 4*a*c;

 

  if (d < 0) { //complex roots

    printf("First root = %.2lf + j%.2lf\n", -b/(double)(2*a), sqrt(-d)/(2*a));

    printf("Second root = %.2lf - j%.2lf\n", -b/(double)(2*a), sqrt(-d)/(2*a));

  }

  else { //real roots

     root1 = (-b + sqrt(d))/(2*a);

     root2 = (-b - sqrt(d))/(2*a);

 

     printf("First root = %.2lf\n", root1);

     printf("Second root = %.2lf\n", root2);

  }

 

  return 0;

}