C#: Calculate root of Quadratic Equation

C# Sharp Conditional Statement: Exercise-11 with Solution

Write a C# Sharp program to calculate the root of a quadratic equation.

Sample Solution:-

C# Sharp Code:

using System;  // Importing the System namespace

public class Exercise11  // Declaration of the Exercise11 class
{  
    public static void Main()  // Entry point of the program
    {
        int a, b, c;  // Declaration of integer variables a, b, and c for quadratic equation coefficients
        double d, x1, x2;  // Declaration of double variables d, x1, and x2 for discriminant and roots
        Console.Write("\n\n");  // Printing new lines
        Console.Write("Calculate root of Quadratic Equation :\n");  // Displaying the purpose of the program
        Console.Write("----------------------------------------");  // Displaying a separator
        Console.Write("\n\n");

        Console.Write("Input the value of a : ");  // Prompting user to input the value of coefficient a
        a = Convert.ToInt32(Console.ReadLine());  // Reading the input value of coefficient a from the user
        Console.Write("Input the value of b : ");  // Prompting user to input the value of coefficient b
        b = Convert.ToInt32(Console.ReadLine());  // Reading the input value of coefficient b from the user
        Console.Write("Input the value of c : ");  // Prompting user to input the value of coefficient c
        c = Convert.ToInt32(Console.ReadLine());  // Reading the input value of coefficient c from the user

        d = b * b - 4 * a * c;  // Calculating the discriminant

        if (d == 0)  // Checking if the discriminant is equal to 0
        {
            Console.Write("Both roots are equal.\n");  // Printing a message if both roots are equal
            x1 = -b / (2.0 * a);  // Calculating the root when discriminant is zero
            x2 = x1;  // Assigning the same root to x2
            Console.Write("First Root Root1= {0}\n", x1);  // Printing the root when discriminant is zero
            Console.Write("Second Root Root2= {0}\n", x2);  // Printing the root when discriminant is zero
        }
        else if (d > 0)  // Checking if the discriminant is greater than 0
        {
            Console.Write("Both roots are real and different.\n");  // Printing a message if roots are real and different

            x1 = (-b + Math.Sqrt(d)) / (2 * a);  // Calculating the first root
            x2 = (-b - Math.Sqrt(d)) / (2 * a);  // Calculating the second root

            Console.Write("First Root Root1= {0}\n", x1);  // Printing the first root
            Console.Write("Second Root Root2= {0}\n", x2);  // Printing the second root
        }
        else
        {
            Console.Write("Roots are imaginary;\nNo Solution. \n\n");  // Printing a message if roots are imaginary
        }
    }
}

Sample Output:

Calculate root of Quadratic Equation :                                                                        
----------------------------------------                                                                                                        
Input the value of a : 1                                                                                      
Input the value of b : 2                                                                                      
Input the value of c : 1                                                                                      
Both roots are equal.                                                                                         
First  Root Root1= -1                                                                                         
Second Root Root2= -1 

Visual Presentation:

Flowchart:

C# Sharp Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a C# Sharp program to find the eligibility of admission for a professional course based on the specific criteria.
Next: Write a C# Sharp program to read roll no, name and marks of three subjects and calculate the total, percentage and division.