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C# Dash: Level 2 - Math on Track
DungeonMaster00 (190)

C# Dash: Level 2 - Math on track


Sorry, saving conditionals for third tutorial.

So how did you do on the coding challenge on the last tutorial? Well I linked an example repl at the bottom of the second tutorial for some sample code for the last coding challenge.

Anyways, looks like another day of C# Dash. And we are about to start level 2, Math on Track.

This tutorial will cover essential Math methods and variable type conversion.

The user is expected to have read C# Dash: Level 1 - Object Oriented Madness (below), know what object oriented programming is, and know what square roots and other math around that level is.

DISCLAIMER: These tutorials will not cover complicated concepts, but will cover a basic selection of things to make some decent code.

Some information was retrieved from the Microsoft .NET Online C# Documentation.

Words like this will appear in the glossary at the bottom.


More Tutorials

Scratch Tutorials




SO LET'S GET STARTED!!!!!!!!!




Essential Math Methods

So, if you want to have more complex math in your C# program, you will have to use a Math method. I have a link to the .NET Online C# Documentation for math methods in my last tutorial.

I can't explain every math method in this tutorial, but here are a few essential ones:

  • Math.Sqrt() - Returns the square root of inputted number.
  • Math.Cbrt() - Returns the cube root of inputted number.
  • Math.Max() - Returns the larger of two inputted numbers.
  • Math.Min() - Returns the smaller of two inputted numbers.
  • Math.Abs() - Returns the absolute value of inputted number.
  • Math.Pow() - Returns the number raised to whatever you input.
    • The first number is the one you want to raise.
    • The second number is the power you are raising the first number by.
  • Math.Floor() - Rounds a number down to the nearest integer.
  • Math.Ceiling() - Rounds a number up to the nearest integer.

Example of a Math method:

using System;

class insert_class_name_here {
	public static void Main (string[] args) {
		double var1 = -3;
		double var2 = Math.Abs(var1);
		Console.WriteLine(var2);//Will output: 3
	}
}

Variable Conversion

Sometimes, you need to convert between types (like string to double) in order for the program to work. You write these methods for variables. This will show one method for that.

The method is Convert. You can convert it to different things. These are the examples for the types I showed you.

  • Convert.ToString() - Converts a non-string variable to a string.
  • Convert.ToChar - Converts a non-single-character variable to a single character (throws an exception if thing being converted has more than one character or is a double.)
  • Convert.ToInt32() - Converts a non-32-bit-integer variable to a 32-bit integer and removes numbers after the floating-point.
  • Convert.ToDouble() - Converts a non-double variable to a double.

    NOTE: Converting to an int or a double with letters will throw an exception.

Example of this kind of conversion:

using System;

class insert_class_name_here {
	public static void Main (string[] args) {
		string var1 = "5.2";
		double var2 = Convert.ToDouble(var1);
		Console.WriteLine(var2 - 4);//Will output: 1.2
	}
}

That was one way to convert between types.






Level Complete!






Next tutorial will be about conditionals and arrays.


Coding challenge (optional)

Write a program that will take a number the user typed in and write the square root for that number. There will be variable conversion and Math methods involved.
















































Glossary

  • Method - Some code that is called with ()s. Examples include Console.WriteLine() and Math.Max(). Inside some methods, you put in arguments for output.
  • Variable - Stored data under a name.
  • Exception - An error occurring while program is running.

Example code for challenge in Level 1: