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day four
[advent21.git]
/
02b.l
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%option noyywrap
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%option noinput
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%option nounput
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%{
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#include <stdio.h>
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int x = 0, z = 0, aim = 0;
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%}
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%%
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forward\ [0-9] {
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int num = atoi(yytext+sizeof("forward"));
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x += num;
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z += aim*num;
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}
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up\ [0-9] aim -= atoi(yytext+sizeof("up"));
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down\ [0-9] aim += atoi(yytext+sizeof("down"));
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\n ;
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%%
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int main (void)
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{
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yylex();
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printf("%d\n", x*z);
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return 0;
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}