Practice Exercises C# Sharp

Practice Exercises C# Sharp

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Two dimensional array 2: circunference on screen - Practice Exercises C# Sharp


Lesson 4:

Structures and Strings


Exercise 4.22:

Two dimensional array 2: circunference on screen


Objetive:

Create a C# program that declares creates a 70x20 two-dimensional array of characters, "draws" a circumference or radius 8 inside it, and displays it on screen.

Hint: the points in the circumference can be obtained using:
x = xCenter + r * cos angle
y = yCenter + r * sin angle

"sin" and "cos" expect the angle to be measured in radians, instead of degrees. To convert from one unit to the other, you must remember that 360 degrees = 2 PI radians (or 180 degrees = PI radians): float radians = (angle * Math.PI / 180.0);

You might draw 72 points (as there are 360 degrees in a circumference, they would be spaced 5 degreees from each other)

Hint: in C#, cosine is Math.Cos, sine is Math.Sin and PI is Math.PI



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Source Code:


using System;
public class Circunference
{
    public static void Main()
    {
        double r, x, y;

        for (int i = 0; i < 360; i += 5)
        {
            rad = i * Math.PI / 180.0;
            x = 35 + 8 * Math.Cos(rad);
            y = 10 + 8 * Math.Sin(rad);

            Console.SetCursorPosition((int)x, (int)y);
            Console.Write("X");
        }

        Console.SetCursorPosition(1, 20);
    }
}

                
Exercisey 4.22

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