test.cpp

消除文法左递规算法的实现(此为可执行源代码)

//实验三 消除产生式左递归
#include<iostream.h>
#include<fstream.h>
#include"subg.h"

void main()     //注解请见本目录下的实验报告......
{
	sub_G g;
	ifstream infile;
	ofstream outfile;
	infile.open("input.txt");
	if(!infile)
	{
		cout<<"Can not open input.txt"<<endl;
		return;
	}
	outfile.open("out.txt");
	if(!outfile)
	{
		cout<<"Can not open output.txt"<<endl;
		return;
	}
	g.read_G_from(infile);
	g.remove_leftDG();
	g.write_G_to(outfile);
	infile.close();
	outfile.close();
}