Computer Programs

CS 1400

Dennis A. FaircloughVersion 1.1

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Overview

• Computer Programs– Data– Methods– Program

• Puts it all together

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C# Data• Integers (whole numbers)

– int, sbyte, short, long (Signed)– uint, byte, ushort, ulong (Unsigned)

• Floating Point– double, float, decimal (Signed only)

• Others– char, bool

• Reference Type Objects– object, string

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Methods• Console

– Output to Display• WriteLine(…)• Write(…)

– Input from Keyboard• ReadLine(…)• Read(…)

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Programclass Program{ void Main() {

System.Console.WriteLine(“Hello, world!”); System.Console.ReadLine(); }//End Main()}//End class Program

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Programusing System;class Program{

void Main(){

string sData = “”;int iData = 0;double dData = 0.0;Console.WriteLine(“Enter: string, int, double”);

sData = Console.ReadLine();iData = int.Parse(Console.ReadLine());dData = double.Parse(Console.ReadLine());Console.ReadLine();

}//End Main()}//End class Program

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Data Characteristics• Size

– int – 32 bits– double – 64 bits– char - 16 bits – string – length based on number of char’s + ‘\0’

• Shape– char– int – double– string

• Methods– char –ToUpper(…), ToString(…)– int – Parse(…), ToString(…)– double – parse(…), ToString(…)– string – SubString(…), ToUpper(…)