436fd0a6cd
ysyx_22040000 李心杨 Linux calcite 6.1.69 #1-NixOS SMP PREEMPT_DYNAMIC Wed Dec 20 16:00:29 UTC 2023 x86_64 GNU/Linux 10:21:30 up 1 day 10:37, 2 users, load average: 0.29, 0.40, 0.48
36 lines
800 B
Text
36 lines
800 B
Text
%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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extern int yylex(void);
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void yyerror(uint32_t *result, const char *err) {
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fprintf(stderr, "Error: %s\n", err);
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}
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%}
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%token NUMBER HEX_NUMBER
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%start input
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%define api.value.type { uint32_t }
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%parse-param { uint32_t *result }
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%left '-' '+'
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%left '*' '/'
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%%
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input
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: expression { *result = $1; }
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;
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expression
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: number { $$ = $1; }
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| expression '+' expression { $$ = $1 + $3; }
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| expression '-' expression { $$ = $1 - $3; }
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| expression '*' expression { $$ = $1 * $3; }
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| expression '/' expression { if($3 == 0) { perror("Devide by 0\n"); YYABORT; }; $$ = $1 / $3;}
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| '-' number { $$ = -$2; }
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| '(' expression ')' { $$ = $2; }
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number
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: NUMBER
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| HEX_NUMBER
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%%
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