25 lines
1.7 KiB
Plaintext
25 lines
1.7 KiB
Plaintext
\begin{Verbatim}[commandchars=\\\{\},codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8\relax}]
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\PYG{c+c1}{// first, b & c are pushed onto the stack}
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\PYG{k+kt}{int}\PYG{+w}{ }\PYG{n}{b}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{l+m+mi}{100}\PYG{p}{;}
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\PYG{k+kt}{int}\PYG{+w}{ }\PYG{n}{c}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{l+m+mi}{50}\PYG{p}{;}
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\PYG{c+c1}{// when swap() is called, x, y, & temp are pushed onto the stack}
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\PYG{k+kt}{void}\PYG{o}{*}\PYG{+w}{ }\PYG{n+nf}{swap}\PYG{p}{(}\PYG{k+kt}{int}\PYG{o}{*}\PYG{+w}{ }\PYG{n}{x}\PYG{p}{,}\PYG{+w}{ }\PYG{k+kt}{int}\PYG{o}{*}\PYG{+w}{ }\PYG{n}{y}\PYG{p}{)}\PYG{+w}{ }\PYG{p}{\PYGZob{}}
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\PYG{+w}{ }\PYG{k+kt}{int}\PYG{+w}{ }\PYG{n}{temp}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{o}{*}\PYG{n}{x}\PYG{p}{;}
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\PYG{+w}{ }\PYG{c+c1}{// we allocate space in memory to perm using malloc}
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\PYG{+w}{ }\PYG{k+kt}{int}\PYG{o}{*}\PYG{+w}{ }\PYG{n}{perm}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{malloc}\PYG{p}{(}\PYG{k+kt}{int}\PYG{p}{);}
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\PYG{+w}{ }\PYG{n}{perm}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{o}{\PYGZam{}}\PYG{n}{temp}\PYG{p}{;}
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\PYG{+w}{ }\PYG{n}{x}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{y}\PYG{p}{;}
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\PYG{+w}{ }\PYG{n}{y}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{o}{*}\PYG{n}{perm}\PYG{p}{;}
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\PYG{+w}{ }\PYG{c+c1}{// when swap returns, x, y, & temp are popped from the stack}
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\PYG{+w}{ }\PYG{c+c1}{// the memory allocated to perm is still in use}
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\PYG{+w}{ }\PYG{k}{return}\PYG{+w}{ }\PYG{n}{perm}\PYG{p}{;}
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\PYG{p}{\PYGZcb{}}
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\PYG{k+kt}{void}\PYG{o}{*}\PYG{+w}{ }\PYG{n}{p}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{swap}\PYG{p}{(}\PYG{n}{b}\PYG{p}{,}\PYG{+w}{ }\PYG{n}{c}\PYG{p}{);}
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\PYG{n}{free}\PYG{p}{(}\PYG{n}{p}\PYG{p}{);}
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\end{Verbatim}
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