不完整 \iftrue；行后的所有文本均被忽略

Question

关于这个问题我可以将我的翻译与原文保留在一起吗？我学习了如何做 if，但是当我像这样在本文档中使用它时：

\documentclass[10pt,a5paper,twoside]{memoir}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage[brazil]{babel}
\usepackage[showframe,pass]{geometry}

\newif\ifdebug
\debugfalse
\debugtrue

\begin{document}

Arquivo compilado \ifdebug22:00\else\currenttime\fi h do dia \ifdebugTODAY\else\today\if.

\end{document}

它会引发错误：

! Undefined control sequence.
l.81 ...else\currenttime\fi h do dia \ifdebugTODAY
                                                  \else\today\if.
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Extra \else.
l.81 ...currenttime\fi h do dia \ifdebugTODAY\else
                                                  \today\if.
I'm ignoring this; it doesn't match any \if.

)
! Incomplete \if; all text was ignored after line 81.
<inserted text> 
                \fi 
<*> ./test2.tex

The file ended while I was skipping conditional text.
This kind of error happens when you say `\if...' and forget
the matching `\fi'. I've inserted a `\fi'; this might work.

! Emergency stop.
<*> ./test2.tex

*** (job aborted, no legal \end found)

但如果我改变 if 行并添加一些空格：

Arquivo \ifdebug 22:00 \else \currenttime \fi h do dia \ifdebug TODAY \else \today \if .

错误变成：

! Incomplete \iftrue; all text was ignored after line 81.
<inserted text> 
                \fi 
<*> ./test2.tex

The file ended while I was skipping conditional text.
This kind of error happens when you say `\if...' and forget
the matching `\fi'. I've inserted a `\fi'; this might work.

! Emergency stop.
<*> ./test2.tex

*** (job aborted, no legal \end found)

---

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Answer 1

有两处拼写错误：

Arquivo compilado \ifdebug22:00\else\currenttime\fi h do dia \ifdebugTODAY\else\today\if.

第一个错误是\ifdebugTODAY，它指的是一个未知的条件，所以这里和\debugTODAY之间的空格很重要。\ifdebugTODAY

\ifdebug22:00由于后面的数字清楚地界定了条件\ifdebug的名称，因此空格不是必需的。debug

第二个错误是\if末尾的 。它应该是\fi。

\documentclass[10pt,a5paper,twoside]{memoir}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage[brazil]{babel}
\usepackage[showframe,pass]{geometry}

\newif\ifdebug
\debugfalse
\debugtrue

\begin{document}

Arquivo compilado \ifdebug 22:00\else\currenttime\fi h do dia \ifdebug TODAY\else\today\fi.

\end{document}