46 lines
961 B
Plaintext
46 lines
961 B
Plaintext
%token_type {int}
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%left PLUS MINUS.
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%left DIVIDE TIMES.
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%include {
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "calculator-c.h"
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}
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%code {
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int main()
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{
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void* pParser = ParseAlloc(malloc);
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ParseTrace(stderr, "> ");
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Parse(pParser, INTEGER, 1);
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Parse(pParser, PLUS, 0);
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Parse(pParser, INTEGER, 2);
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Parse(pParser, TIMES, 0);
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Parse(pParser, INTEGER, 10);
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Parse(pParser, DIVIDE, 0);
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Parse(pParser, INTEGER, 2);
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Parse(pParser, 0, 0);
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ParseFree(pParser, free);
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}
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}
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%syntax_error {
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fprintf(stderr, "Syntax error\n");
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}
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program ::= expr(A). { printf("Result=%d\n", A); }
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expr(A) ::= expr(B) MINUS expr(C). { A = B - C; }
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expr(A) ::= expr(B) PLUS expr(C). { A = B + C; }
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expr(A) ::= expr(B) TIMES expr(C). { A = B * C; }
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expr(A) ::= expr(B) DIVIDE expr(C). {
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if (C != 0) {
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A = B / C;
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} else {
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fprintf(stderr, "Divide by zero\n");
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}
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}
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expr(A) ::= INTEGER(B). { A = B; }
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