c++ program to find roots of quadratic equation || roots of quadratic equation in c/c++

Write a program to calculate the roots of a given quadratic equation -

      a(x^2) + bx + c = 0 

Print roots specifying their nature. If roots are imaginary, 

no need to print the roots.

Print the nature of roots in the form of an integer -

 0 : if roots are real & same

 1 : if roots are real & different

-1 : if roots are imaginary

Round off the roots and then print the integral part only i.e. without any decimal places.

You can assume that, input will always be a quadratic equation.

Input format :

a b c (separated by space)

Output format :

Line 1 : Nature of roots (0 or 1 or -1)

Line 2 : Root 1 and Root 2 (separated by space)

Sample Input 1 :

1 4 2

Sample Output 1 :

1

-1 -3

CODE :

#include <iostream>

#include <cmath>

using namespace std;

int main()

{

  int a, b, c;

  cin >> a >> b >> c;

  int disc = (b*b) - (4*a*c);

  if(disc<0)

  {

    cout << -1;

  }

  else

  {

    float x = sqrt(disc);

    float root1 = (-b + x)/(2*a);

    float root2 = (-b - x)/(2*a);

    int p = round(root1);

    int q = round(root2);

    if((int)x == 0)

    {

      cout << 0 << endl;

    }

    else

    {

      cout << 1 << endl;

    }

    cout << p << " " << q << endl;

  }

}

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Milan Tomic

Hi. I’m Designer of Blog Magic. I’m CEO/Founder of ThemeXpose. I’m Creative Art Director, Web Designer, UI/UX Designer, Interaction Designer, Industrial Designer, Web Developer, Business Enthusiast, StartUp Enthusiast, Speaker, Writer and Photographer. Inspired to make things looks better.

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