Console applicatie static void Main ( ) class Hallo { } { } Console. WriteLine("Hallo " + naam + "!" ); statische methodestatische methoden Console. WriteLine("Wat.

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Presentation transcript:

Console applicatie static void Main ( ) class Hallo { } { } Console. WriteLine("Hallo " + naam + "!" ); statische methodestatische methoden Console. WriteLine("Wat is je naam?"); string naam = Console. ReadLine( );

class Console static void WriteLine( string s ) class Console { } { } Console. Out. WriteLine( s ); static string ReadLine( ) { } return Console. In. ReadLine( ); TextReader In { get; } TextWriter Out { get; }

class TextReader abstract string ReadLine( ) ; class TextReader { } string ReadToEnd( ) { } string resultaat, regel; return resultaat; regel = this.ReadLine( ); while (regel != null) { } resultaat += regel + "\n" ; regel = this.ReadLine( ); TextReader StreamReader StringReader abstract

class TextReader abstract string ReadLine( ) ; class TextReader { } string ReadToEnd( ) { } string resultaat, regel; return resultaat; while (regel != null) { } resultaat += regel + "\n" ; regel = this.ReadLine( ); ( (regel = this.ReadLine()) != null ) en meteen testen regel = this.ReadLine( ); toekennen

Commandline programma $>date Fri Oct 29, 11:30 $> ls aap.txt hallo.doc prog.cs $> grep void prog.cs prog.cs, line 6: void Main() prog.cs, line 10: void teken() $>ls > files.txt $> parameters voor het programma output redirection

Voorbeeld file-processor nlaat alle regels van de files zien waarin het gegeven patroon voorkomt n(met filenaam en regelnummer) grep patroon file1 file2... Unix-commando

Grep: main class Grep if (params.Length==0) Console.WriteLine("Usage: java Grep pat file..."); else static void Main ( for (int t=1; t<params.Length; t++) Grep.bewerk( params[0], params[t] ); { } { )string [ ] params

Grep: bewerk static void bewerk (String pat, String naam) { regel=buffer.ReadLine() Console.WriteLine( naam if ( regel. Contains (pat) ) reader = new StreamReader (naam); TextReader reader; String regel; while ()( ) != null ; n++ for (int n=1; + n+ regel ); if (naam=="") reader = Console.In; else try { } catch (Exception e) { Console.WriteLine(naam + e); }