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Relationsoperatorer

Relationsoperatorer. Selektioner - if. Selektioner – if-else. Selektioner – if-else if. Selektioner – if-else if-else. Iterationer - while. Iterationer – while med uthopp. Iterationer – do. Iterationer – for. Iterationer – foreach.

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Relationsoperatorer

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  1. Relationsoperatorer

  2. Selektioner - if

  3. Selektioner – if-else

  4. Selektioner – if-else if

  5. Selektioner – if-else if-else

  6. Iterationer - while

  7. Iterationer – while med uthopp

  8. Iterationer – do

  9. Iterationer – for

  10. Iterationer – foreach Observera att for_each i C++ egentligen inte är en iteration på samma sätt som i C# eller Java, utan skapar ett indirekt funktionsanrop för varje element

  11. Filhantering – exempel i C# using System; using System.IO; public class FileReaderTest { public static void Main ( ) { StreamReader infil = new StreamReader("Testa.txt"); while (true) { string line = infil.ReadLine(); if (line == null) break; Console.WriteLine(line); } infil.Close(); } }

  12. Filhantering – exempel i C /* C */ #include <stdio.h> int main(int argc, char *argv[]) { char rad[200]; FILE *infil; infil = fopen("Testa.txt", "r"); while (fgets(rad, 200, infil) != NULL) { printf("%s", rad); /* utskrift mot konsolen */ } fclose(infil); return 1; }

  13. Filhantering – exempel i Visual Basic ' Visual Basic Private Sub ReadFromFile() Dim rad As String Open "konton.dat" For Input As #1 Do While Not EOF(1) Line Input #1, rad Picture1.Print rad ' Picture1 är ett objekt i formuläret ' på vilket vi skriver ut raderna Loop Close #1 End Sub

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