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tex:triky [2010/07/02 18:16]
bejcek if contstructions |
tex:triky [2010/07/02 18:36]
bejcek comparing two strings |
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| * The **if** condition in TeX: | * The **if** condition in TeX: |
| * construction **if ''\variable'' is empty**:\\ ''The variable \if#\variable# is empty.\else contains \variable.\fi''\\ (''\variable'' naturally cannot contain '''#'****'') | * construction **if ''\variable'' is empty**: |
| | * ''The variable \if#\variable# is empty.\else contains \variable.\fi''\\ (''\variable'' naturally cannot contain '''#'****'') |
| | * ''The variable \ifx\@empty\variable is empty.\else contains \variable.\fi'' |
| | * **comparing** two strings:\\ ''\newif\ifsame\\ \newcommand{\strcfstr}[2]{%\\ \samefalse\\ \begingroup\\ \def\1{#1}\def\2{#2}%\\ \ifx\1\2\endgroup \sametrue\\ \else \endgroup\\ \fi}'' |
| | * (I don't know why the grouping is needed there...) |
| | * [[http://www.tug.org/TUGboat/Articles/tb22-4/tb72wilson.pdf|(source, Peter Wilson)]] |
| * allocator **''\newif''** is used in a sequention:\\ a declaration ''\newif\ifsomething''\\ setting either ''\somethingtrue'' or ''\somethingfalse''\\ and asking ''\ifsomething YES\else NO\fi'' | * allocator **''\newif''** is used in a sequention:\\ a declaration ''\newif\ifsomething''\\ setting either ''\somethingtrue'' or ''\somethingfalse''\\ and asking ''\ifsomething YES\else NO\fi'' |
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