while - while keyword
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
The only constraint is that each "then" or "do" keyword must be on the same line line as "while" keyword.
The "keyword "then" or "do" can be replaced by a carriage return or a comma.
The optional ,else instructions construction allows to gives instructions which are executed when expr expression becomes false.
Warning: the number of characters used to define the body of any conditionnal instruction (if while for or select/case) must be limited to 16k.
e=1; a=1; k=1; while norm(a-(a+e),1) > %eps, e=e/2; k=k+1; end e,k
for , select , break , return , pause ,