test.cpp

来自「数学公式分析」· C++ 代码 · 共 35 行

// test.cpp : Definiert den Einsprungpunkt f黵 die Konsolenanwendung.
//

#include "stdafx.h"
#include "..\MathParser\MathParser.h"

int main(int argc, char* argv[])
{
	CStrMap varmap;
	double varvalues[] = { 5, 6.1,0.1 };
	CMathParser mp;
	varmap.AddString( "X", varvalues );
	varmap.AddString( "Y", varvalues+1 );
	varmap.AddString( "SOMEVERYLONGVARIABLENAME", varvalues+2 );

	double result;
	char formula[]="x + sin(y)+pi+SOMEVERYLONGVARIABLENAME";
	mp.Parameters=&varmap;
	char *ErrMsg = mp.Parse( formula, &result );
	printf("%s=",formula);
	if ( ErrMsg == NULL )
		printf( "%.15G\n", result );
	else
		puts( ErrMsg );
	
	varvalues[0]=2;
	varmap.Replace("X",varvalues);
	ErrMsg = mp.Parse( formula, &result );
	printf("after changing the variable value:");
	if ( ErrMsg == NULL )
		printf( "%.15G\n", result );
	else
		puts( ErrMsg );
	return 0;
}