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Chapter 12: Code Construction > General Layout Issues and Techniques
General Layout Issues and Techniques
Most layout issues have to do with laying out blocks of code; there are different types of block layout, some of which are built into languages, some you get to choose on your own. The three most prevalent kinds of block layouts are built-in block boundaries, begin-end block boundaries, and emulating built-in blocks.
Some languages have built-in block boundaries for every control structure in the language. In this case you have no choice; because the block boundary element is a language feature you must use it. Languages that have built-in block boundaries include Ada, PL/1, Lisp and Scheme, and Visual Basic. As an example, an if-then statement in Visual Basic looks like
if income > 25000 then
statement1
statement2
else
statement3
…
end if
