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↻

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8.7 Control Statements

  statement      Bei allen Steueranweisungen kann als
                 statement nur eine Anweisung geschrieben
                 werden

 { statement_1	Mehrere Anweisungen können verwendet werden,
   statement_2	wenn sie mit einer geschweiften Klammer zu
   statement_3	einem Block zusammengefaßt werden.
 }

  { statement_1 ; statement_2 ; statement_3 }   Mehrere An-
 		weisungen in einer Zeile müssen geklammert
                 und durch Semikolon getrennt sein.


break
continue
if (condition) statement [ else statement ]
while (condition) statement
do statement while (condition)
for (expr1; expr2; expr3) statement
for (var in array) statement
delete array[index]
delete array
exit [ expression ]


while


8.7.1 Steueranweisung Schleife vorzeitig verlassen

while 
 


      	break
	continue

8.7.2 Steueranweisung if

while 
  if (condition)  action   [ [;] else action]

 

Beispiel :

END     { if (anzahl > 0 )  printf " Anzahl Dateien %6d\n", anzahl
	 else printf "Leider keine Dateien gefunden\n"
             }


	{   if (pos == 1)	# erster Posten
		kopf()		# Funktion Kopf aufrufen
        	}


8.7.3 Steueranweisungen while

while

8.7.4 Steueranweisungen for

for 
 


    for(expr1; expr2;expr3)
        statement;
 



  Summe der Zahlen von 1 bis 10



  awk '
    END {for (i=1; i<= 10; i++)
	       {	summe += i
	       }
    END { printf "Summe der Zahlen von 1 bis 10 ist %d\n", summe }
       '  /dev/null

 
  •         Summe muß in END-Block gebildet werden, da von /dev/null gelesen wird.
          Somit kommt sofort EOF und der Hauptblock wird nicht durchgeführt.
    • 

 
  •        zweiter END-Block nicht erforderlich        
    •