0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
65 lines
988 B
Plaintext
65 lines
988 B
Plaintext
/*
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* expr.y : A simple yacc expression parser
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* Based on the Bison manual example.
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*/
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%{
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#include <stdio.h>
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#include <math.h>
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%}
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%union {
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float val;
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}
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%token NUMBER
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%token PLUS MINUS MULT DIV EXPON
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%token EOL
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%token LB RB
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%left MINUS PLUS
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%left MULT DIV
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%right EXPON
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%type <val> exp NUMBER
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%%
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input :
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| input line
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;
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line : EOL
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| exp EOL { printf("%g\n",$1);}
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exp : NUMBER { $$ = $1; }
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| exp PLUS exp { $$ = $1 + $3; }
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| exp MINUS exp { $$ = $1 - $3; }
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| exp MULT exp { $$ = $1 * $3; }
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| exp DIV exp { $$ = $1 / $3; }
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| MINUS exp %prec MINUS { $$ = -$2; }
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| exp EXPON exp { $$ = pow($1,$3);}
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| LB exp RB { $$ = $2; }
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;
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%%
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yyerror(char *message)
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{
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printf("%s\n",message);
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}
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int main(int argc, char *argv[])
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{
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yyparse();
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return(0);
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}
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