C# Lesson 4 - Math Operators

All computers really do is add numbers, lots of numbers

The basics

static void Main(string[] args) { //declare variables a,b and c as integers int a, b, c; //Output request Console.WriteLine("Enter 1st Number: "); //Read in a string and convert to integer and store in variable a a = int.Parse(Console.ReadLine()); //repeat for second number Console.WriteLine("Enter 2nd Number: "); b = int.Parse(Console.ReadLine()); //Add a and b together c = a + b; //Output result Console.WriteLine("a+b="+ c); //Press Key to exit Console.ReadKey(); }

Activity

Create a program to;

Calculate the area of a square

Calculate the area of a rectangle

Calculate the area of a cuboid

C# also has provides maths functions for example Pi, Square Root and trigonometric functions

Basic example of PI and Square Root

static void Main(string[] args) { Console.WriteLine("Pi= " + Math.PI); Console.WriteLine("Square Root of PI= " + Math.Sqrt(Math.PI)); //Press a Key to quit Console.ReadKey(); }

Activity

Create a program to

Calculate the circumference of circle

Hint: Diameter multiplied by PI

Calculate the area of a circle

Hint: Pi * r 2 (Pi times Radius squared

Challenge

Can you create a Pythagoras Theorem program?

A 2+B 2 = C 2