C# Exercise 3

Objective:

• Methods in C#

Activity 1:

Write C# program that will ask the user to enter the width and length of a rectangle and then display the rectangle’s area. The program calls the following functions, which have not been written:

• GetLength: This function should ask the user to enter the rectangle’s length and then return that value as a double .
• GetWidth: This function should ask the user to enter the rectangle’s width and then return that value as a double .
• GetArea: This function should accept the rectangle’s length and width as arguments and return the rectangle’s area. The area is calculated by multiplying the length by the width.
• DisplayData: This function should accept the rectangle’s area as argument and display it in an appropriate message on the screen.

Solution:

using System;

class Program
{
    static double GetLength()
    {
        double length;

        Console.WriteLine("Enter Length of Rectangle: ");
        length = Convert.ToDouble(Console.ReadLine());

        return length;
    }

    static double GetWidth()
    {
        double width;

        Console.WriteLine("Enter Width of Rectangle: ");
        width = Convert.ToDouble(Console.ReadLine());

        return width;
    }

    static double GetArea(double i, double j)
    {
        double area;
        area = i * j;

        return area;
    }

    static void DisplayData(double area)
    {
        Console.WriteLine("Area of Rectangle is: " + area);
    }

    static void Main()
    {
        double x, y, area;

        x = GetLength();
        y = GetWidth();

        area = GetArea(x, y);
        DisplayData(area);
    }
}

Activity 2:

Write a function called displayShape that accepts size and shapetype as parameters and displays a square or a triangle of the required size.

So e.g. if the function is called with the following parameters:

displayShape(‘S’, 5); a square of size 5 is displayed as given

1	2	3	4	5
2	4	6	8	10
3	6	9	12	15
4	8	12	16	20
5	10	15	20	25

 

displayShape(‘T’, 6); a triangle of size 6 is displayed as given

                1

             1  1

           1  2  1

         1  3  3  1

       1  4  6  4  1

   1 5  10  10  5  1 

Solution:

using System;

class Program
{
    static void PrintSquare(int size)
    {
        int num, res;
        for (int i = 1; i <= size; i++)
        {
            num = i;
            for (int j = 1; j <= size; j++)
            {
                res = num * j;
                Console.Write(res + "\t");
            }
            Console.Write("\n");
        }
        Console.Write("\n");
    }

    static void PrintTriangle(int size)
    {
        int coef = 1;
        for (int i = 0; i < size; i++)
        {
            for (int space = 1; space <= size - i; space++)
            {
                Console.Write("  ");
            }
            for (int j = 0; j <= i; j++)
            {
                if (j == 0 || i == 0)
                {
                    coef = 1;
                }
                else
                {
                    coef = coef * (i - j + 1) / j;
                }
                Console.Write(coef + "   ");
            }
            Console.Write("\n");
        }
    }

    static void Main()
    {
        char choice2 = 'y';

        do {
            int size;
            char choice;

            Console.WriteLine("Enter Size of Shape: ");
            size = Convert.ToInt32(Console.ReadLine());
            
            Console.WriteLine("Enter s for Square-shape or t for triangle-shape: ");
            choice = Convert.ToChar(Console.ReadLine());

            if (choice == 's')
            {
                PrintSquare(size);
            }
            if (choice == 't')
            {
                PrintTriangle(size);
            }

            Console.WriteLine("If you want to Repeat then press y. ");
            choice2 = Convert.ToChar(Console.ReadLine());

        } while (choice2 == 'y');
    }
}

Activity 3:

Write a program that converts a binary number into decimal number.

Solution:

using System;

class Program
{
    static int DecimalConverter(int num)
    {
        int dec = 0, i = 0, rem;
        bool possible = true;
        while (num != 0)
        {
            rem = num % 10;
            num /= 10;
            if (rem == 0 || rem == 1)
            {
                dec += rem * (int)Math.Pow(2, i);
                ++i;
            }
            else
            {
                Console.WriteLine("Conversion not possible: it is not a binary number.");
                possible = false;
                break;
            }
        }
        if (possible == true)
        {
            return dec;
        }
        return 0;  // Need to return a value in all paths
    }

    static void Main()
    {
        int n;
        Console.Write("Enter a Binary Number: ");
        n = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("Decimal Number: " + DecimalConverter(n));
    }
}