compile_work1.cpp

一个简单的表达式编译器,大家可以试一试.

#include<iostream.h>
#include<string.h>
#include<stdio.h>
#include <process.h>
#include"Comilpe_work1.h"

void main()
{
    CComilpe_work1 pl;

    FILE *out;
	if((out=fopen("outfile.txt","w"))==NULL)
	{
         cout<<"cannout open outfile"<<endl;
         exit(1);
	}
    fprintf(out,"%s%s\n","表达式:",pl.buffer);
	pl.block();
	
	//cout<<"the pcode is:"<<endl;
	fprintf(out,"%s\n","生成PL/0栈式指令代码");
	for(int p_xy=0;p_xy<pl.code_pointer;p_xy++)  //输出pcode代码
	{
		//cout<<pl.code[p_xy].f<<"   "<<pl.code[p_xy].l<<"    "<<pl.code[p_xy].a<<endl;
	    fprintf(out,"%s%s%s%d%s%d%s\n","(",pl.code[p_xy].f,"  ",pl.code[p_xy].l,"  ,  ",pl.code[p_xy].a,")");
	}
	//cout<<"the result is: "<<pl.stoken[pl.t]<<endl;  //输出计算结果
	fprintf(out,"%s%d","表达式结果为:",pl.stoken[pl.t]);
    fclose(out);
	cout<<"文件infile中表达式执行完毕,结果存储在文件outfile中!"<<endl;
}