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3.5.6 Flow control
A block is a sequence of commands surrounded by { and }.
{
command;
...
}
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if and else structures allow conditional
execution of blocks (see if, else). for and while
loops are available for a repeated execution of blocks (see for,
while). In procedure definitions, the main part and the example section
are blocks as well(see proc).
5.2.2 break 5.2.13 quit 5.2.11 keepring 5.2.6 export 5.2.7 exportto 5.2.9 if 5.2.10 importfrom 5.2.5 else 5.2.8 for 5.2.15 while 4.17 proc 5.2.14 return 5.2.4 continue