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tex:triky [2010/07/02 18:36]
bejcek comparing two strings |
tex:triky [2010/07/02 19:15]
bejcek grouping question resolved |
| * ''The variable \if#\variable# is empty.\else contains \variable.\fi''\\ (''\variable'' naturally cannot contain '''#'****'') | * ''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'' | * ''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}'' | * **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...) | * (The grouping is needed there to make '\1' and '\2' local but '\sametrue' global.) |
| * [[http://www.tug.org/TUGboat/Articles/tb22-4/tb72wilson.pdf|(source, Peter Wilson)]] | * [[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'' |
