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Hoofdstuk 9

Hoofdstuk 9. Arrays. (poging 1). CirkelKlikker. int x, y;. void klik(object o, MouseEA mea) { }. this .x = mea.X; this .y = mea.Y; this .Invalidate();. void teken(object o, PaintEA pea) { }. Graphics gr = pea.Graphics;. tekent alleen laatste cirkel.

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Hoofdstuk 9

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  1. Hoofdstuk 9 Arrays

  2. (poging 1) CirkelKlikker int x, y; void klik(object o, MouseEA mea) { } this.x = mea.X; this.y = mea.Y; this.Invalidate(); void teken(object o, PaintEA pea) { } Graphics gr = pea.Graphics; tekent alleenlaatste cirkel gr.FillEllipse(Brushes.Black,this.x, this.y, 15, 15 );

  3. (poging 2) CirkelKlikker void klik(object o, MouseEA mea) { Graphics gr =this.CreateGraphics(); hertekent hetwindow nietwanneer nodig gr.FillEllipse(Brushes.Black, mea.x, mea.y, 15, 15 ); }

  4. (final version) CirkelKlikker int x, y; [ ] int n=0; void klik(object o, MouseEA mea) { } this.x = mea.X; this.y = mea.Y; this.Invalidate(); [n] [n] n++; void teken(object o, PaintEA pea) { } Graphics gr = pea.Graphics; ARRAY for (int t=0; t<n; t++) gr.FillEllipse(Brushes.Black,this.x , this.y , 15, 15 ); [t] [t]

  5. tabel 5 length 0 1 2 3 4 Arrays • Array: rij genummerde variabelen declaratie vaneen array int [ ] tabel; tabel = newint [5]; creëren vanhet eigenlijkearray-object

  6. tabel 5 length 0 1 2 3 4 Gebruik van een array • ’t zijn echte variabelen: tabel [2] = 37; tabel[4] = tabel [2] + 5; if (tabel.Length<10) ... 37 tabel.Length = 10; 42 Length is eenread-only property

  7. tabel 5 length 42 0 1 42 2 42 3 42 4 42 Gebruik van een array • variabele als index in de array tabel [0] = 42; tabel [1] = 42; tabel [2] = 42; tabel [3] = 42; tabel [4] = 42; for (t=0; t<5; t++) tabel [t] = 42;

  8. tabel 5 length 0 12 1 95 2 11 3 23 4 15 Array als parameter int Kleinste ( int [ ] tabel ) { } int resultaat; int t; resultaat =tabel [0]; for (t=0; t<tabel.Length; t++) if (tabel [t] < resultaat) resultaat = tabel [t]; return resultaat;

  9. tabel 5 length 0 12 1 95 2 11 3 4 Deel van de array doorzoeken static int Kleinste ( int [ ] tabel ) { } , int aantal) int resultaat; int t; resultaat =tabel [0]; for (t=0; t<tabel.Length; t++) aantal if (tabel [t] < resultaat) resultaat = tabel [t]; return resultaat;

  10. (final version) CirkelKlikker int [ ] x, y; int n; int r=7; void teken(object o, PaintEA pea) { } Graphics gr = pea.Graphics; for (int t=0; t<n; t++) gr.FillEllipse(Brushes.Black,this.x[t], this.y[t], 15, 15) ; intminX = Bieb.Kleinste(x,n)–r; intmaxX = Bieb.Grootste(x,n)+r; intminY = Bieb.Kleinste(y,n)–r; ARRAY intmaxY = Bieb.Grootste(y,n)+r; gr.DrawRectangle(Brushes.Blue, minX, minY, maxX-minX, maxY-minY ) ;

  11. Syntax van array-type type struct naam sbyte byte float bool waarde short ushort double char int uint decimal long ulong string array [ ] object , verwijzing class naam

  12. tabel Array van getallen 5 length 0 int [ ] tabel; 1 2 tabel = newint [5]; 3 4

  13. tabel Array van struct-objecten 5 length 0 Point[ ] tabel; 1 new Point[5]; tabel = 2 3 4

  14. tabel Array van class-objecten 5 length 0 Button [ ] tabel; 1 new Button[5]; tabel = 2 3 for (int t=0; t<5; t++) 4 tabel[t] = new Button();

  15. tabel Twee-dimensionale array 5 3 length 0 int [ , ] tabel; 1 2 newint [5,3]; tabel = 3 4 tabel.GetLength(0) tabel.GetLength(1) 2 0 1

  16. tabel Array van arrays 5 length 0 int [ ] [ ] tabel; 1 new int[5][]; tabel = 2 3 for (int t=0; t<5; t++) tabel[t] = new int[t]; 4

  17. tabel Drie-dimensionale array 5 3 2 length 1 0 int [ , , ] tabel; 0 newint [5,3,2]; tabel = 1 2 3 4 2 0 1

  18. Declaratie met intitialisatie declaratie const = initialisatie type naam ; initialisatie var , expressie { initialisatie } , int [ ] maand = { 31,28,31,30,31,30,31,31,30,31,30,31 }; string [ ] woorden = { "aap", "noot", "mies" }; int [ , ] = { {1,2,3,4}, {5,6,7,8} };

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