C Programming Yellow Book

Simple Data Processing
A First C# Program
2 Simple Data Processing
2.1 A First C# Program
2.1.1 The Program Example
using System;
In this chapter we are going to create a genuinely useful program (particularly if you
are in the double glazing business). We will start by creating a very simple solution and
investigating the C# statements that perform basic data processing. Then we will use
additional features of the C# language to improve the quality of the solution we are
producing.
The first program that we are going to look at will read in the width and height of a
window and then print out the amount of wood and glass required to make a window
that will fit in a hole of that size. This is the problem we set out to solve as described in
section1.2.2
Perhaps the best way to start looking at C# is to jump straight in with our first ever C#
program. Here it is:
class GlazerCalc
{
static void Main()
{
double width, height, woodLength, glassArea;
string widthString, heightString;
widthString = Console.ReadLine();
width = double.Parse(widthString);
heightString = Console.ReadLine();
height = double.Parse(heightString);
woodLength = 2 * ( width + height ) * 3.25 ;
glassArea = 2 * ( width * height ) ;
}
}
Console.WriteLine ( "The length of the wood is " +
woodLength + " feet" ) ;
Console.WriteLine( "The area of the glass is " +
glassArea + " square metres" ) ;
Code Sample 01 GlazerCalc Program
This is a valid program. If you gave it to a C# compiler it would compile, and you
could run it. The actual work is done by the two lines that I have highlighted. Broadly
speaking the stuff before these two lines is concerned with setting things up and getting
the values in to be processed. The stuff after the two lines is concerned with displaying
the answer to the user.
We can now go through each line in turn and try to see how it fits into our program.
C# Programming © Rob Miles 2015 14