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Scilab Help >> Scilab > Control flow > while

while

while keyword

Description

The while clause must be terminated by "end".

while expr ,instructions,...[,else instructions], end

while expr do instructions,...[,else instructions], end

while expr then instructions,...[,else instructions], end

Notes:

  • The only constraint is that each then or do keyword must be on the same line as while keyword.

  • Keywords then or do can be replaced by a carriage return or a comma. For compatibility with Matlab it is also possible, but not recommended, to put a space between the end of the expression and the beginning of the first instruction.

  • The optional [,else instructions] construction allows to gives instructions which are executed when expr expression becomes false.

According to the Code Conventions for the Scilab Programming Language it is recommended:

  • Start each statement on a new line.

  • Write no more than one simple statement per line.

  • Break compound statements over multiple lines.

For example, use:

i = 0
while i<5
    disp("i");
    i = i + 1;
end

rather than

i = 0; while i<5 disp("i"); i = i + 1; end

Warning: the number of characters used to define the body of any conditional instruction (if while for or select/case) must be limited to 16k.

Examples

e=1; a=1; k=1;
while norm(a-(a+e),1) > %eps,
    e=e/2;
    k=k+1;
end
e,k

See Also

  • for — language keyword for loops
  • select — select keyword
  • break — keyword to interrupt loops
  • return — return or resume execution and copy some local variables
  • pause — pause mode, invoke keyboard

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Last updated:
Thu Oct 02 13:46:44 CEST 2014