C# Exercise 1

Objective:

1. Introduction to C#
2. How to compile C# code
3. Simple arithmetic problems solving

Activity 1:

Take two inputs from user (keyboard) length and breadth of rectangle. Compute the area of rectangle given by: area = length*breadth

Solution:

using System;

class Program
{
    static void Main()
    {
        int length = 0;
        int breadth = 0;
        int area = 0;

        Console.WriteLine("Enter Length and Breadth of Rectangle");

        length = Convert.ToInt32(Console.ReadLine());
        breadth = Convert.ToInt32(Console.ReadLine());

        area = length * breadth;

        Console.WriteLine("The Area is = " + area);
    }
}

Activity 2:

Write C# code to solve the second-degree equation aX^2 + bX + c= 0 for any real numbers a, b and c. The program takes the values of a, b and c as input from the user, and calculates X.

Note: real numbers are taken in float.

Solution:

using System;

class Program
{
    static void Main()
    {
        float a = 0;
        float b = 0;
        float c = 0;
        float X = 0;

        Console.WriteLine("Enter three Real Numbers a, b and c: ");

        a = Convert.ToSingle(Console.ReadLine());
        b = Convert.ToSingle(Console.ReadLine());
        c = Convert.ToSingle(Console.ReadLine());

        float eq1;
        float sq;
        float eq2;
        float eq3;

        eq1 = (b * b) - (4 * a * c);
        sq = (float)Math.Sqrt(eq1);

        eq2 = (-b - sq) / (2 * a);
        Console.WriteLine("The First value of X is = " + eq2);

        eq3 = (-b + sq) / (2 * a);
        Console.WriteLine("The Second value of X is = " + eq3);
    }
}