% ifthen.sty 16-Dec-86

\long\def\ifthenelse#1#2#3{\setbox\@tempboxa
 \vbox{\let\protect\noexpand
 \let\or\@or \let\and\@and \let\not\@neg \let\(\@lparen \let\)\@rparen
 {\let\if\relax\let\ifx\relax\let\ifnum\relax\let\fi\relax
 \let\else\relax \xdef\@gtempa{#1}}\expandafter
 \@eval \ifnum \@gtempa\relax \def\@term{T}\else \def\@term{F}\fi
 \@endeval\global\let\@gtempa\@val}\if\@gtempa T#2\else#3\fi}
\def\@eval{\def\@val{F}\def\@orop{T}\def\@negate{F}}
\def\@endeval{\if\@negate T\def\@negate{F}\if\@term T\def\@term{F}\else 
 \def\@term{T}\fi\fi
 \if\@orop T\if\@val F\let\@val\@term\fi
 \else \if\@val T\let\@val\@term\fi\fi}
\def\@or{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi
 \noexpand\@endeval \def\noexpand\@orop{T}\ifnum}
\def\@and{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi
 \noexpand\@endeval\def\noexpand\@orop{F}\ifnum}
\def\@neg{1=1 \fi \def\noexpand\@negate{T}\ifnum}
\def\@lparen{1=1 \fi \begingroup \noexpand\@eval \ifnum}
\def\@rparen{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi 
 \noexpand\@endeval \if\noexpand\@val T\gdef\noexpand\@gtempb{1=1}\else 
 \gdef\noexpand\@gtempb{1=0}\fi
 \endgroup \ifnum\noexpand\@gtempb}
\def\equal#1#2{1=1 \fi \edef\noexpand\@tempa{#1}\edef\noexpand\@tempe{#2}\ifx
 \noexpand\@tempa\noexpand\@tempe 
 \def\noexpand\@tempa{1=1}\else
 \def\noexpand\@tempa{1=0}\fi \ifnum \noexpand\@tempa}
\long\def\whiledo#1#2{\ifthenelse{#1}{\@whiledotrue \@whilesw\if@whiledo
 \fi{#2\ifthenelse{#1}{\@whiledotrue}{\@whiledofalse}}}{}}
\newif\if@whiledo