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Update calculator example in README.md

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Charles Baker 2018-07-02 21:22:23 +12:00
parent 5d86d4e956
commit c601ef4e3e
1 changed files with 7 additions and 6 deletions
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13
README.md
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@ -14,6 +14,7 @@ Modern [LALR(1)](https://en.wikipedia.org/wiki/LALR_parser) parser generator and
## Example
~~~c++
#include <stdio.h>
#include <stdarg.h>
#include <lalr/GrammarCompiler.hpp>
@ -23,32 +24,32 @@ Modern [LALR(1)](https://en.wikipedia.org/wiki/LALR_parser) parser generator and
using namespace std;
using namespace lalr;
static int add( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int add( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return start[0].user_data() + start[2].user_data();
}
static int subtract( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int subtract( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return start[0].user_data() - start[2].user_data();
}
static int multiply( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int multiply( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return start[0].user_data() * start[2].user_data();
}
static int divide( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int divide( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return start[0].user_data() / start[2].user_data();
}
static int compound( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int compound( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return start[1].user_data();
}
static int integer( const ParserSymbol* symbol, const ParserNode<int>* start, const ParserNode<int>* finish )
static int integer( const ParserNode<int>* start, const ParserNode<int>* finish )
{
return ::atoi( start[0].lexeme().c_str() );
}