Basic HTML version of Foils prepared Sept 20 97

Foil 27 Control Structures --
while,until Statements

From Tutorial on PERL Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
1 The simplest iterations are while and until
2 while ( TESTEXPRESSION ) {
  • some statement block; # if TESTEXPRESSION true
3 }
4 For example:
5 while ( <STDIN> ) {
  • Process Current Input line; # until EOF in <STDIN>
6 }
7 Conversly we can wait for a signal to stop:
8 until ( TESTEXPRESSION ) {
  • some statement block; # if TESTEXPRESSION false
9 }
in Table To:

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