利用高级语言的递归过程为给定文法的每个非终结符构造对应的递归函数

				#include "fstream.h"
				#include "iostream.h"
				#include "stdlib.h"
				struct code_val{
					char code;char val[20];
				} t; //定义临时结构变量，存放单词二元式。
				ifstream cinf("lex_r.txt",ios::in); 		//从文件lex_r.txt输入数据
				ofstream coutf("par_r.txt",ios::out);		//结果输出至文件par_r.txt
				void E(void);
				void F(void)		//F→(E)|i|x|y
				{
					if(t.code=='i'||t.code=='x'||t.code=='y')
				    { 
						cinf>>t.code>>t.val;coutf				    }
					else 
						if(t.code=='(')
						{
							cinf>>t.code>>t.val;coutf							E( );
							if(t.code==')')
							{
								cinf>>t.code>>t.val;coutf							}
							else{
								coutf							}
						}
						else{
							coutf						}
				}
				void T1(void)		//T'→*FT'|ε
				{
					if(t.code=='*')
					{
						cinf>>t.code>>t.val;coutf						F( );T1( );
					}
					else 
						if(!(t.code=='#'||t.code==')'||t.code=='+'))
				        { 
							coutf						}
				}
				void T(void)		//T→FT'
				{
					if(t.code=='i'||t.code=='x'||t.code=='y'||t.code=='(')
					{
						F( );T1( );
					}
					else{
						coutf					}
				}
				void E1(void)		//E'→+TE'|ε
				{
				   if(t.code=='+')
				   {
					   cinf>>t.code>>t.val;coutf					   T( );E1( );
				   }
				   else 
				      if(!(t.code=='#'||t.code==')'))
						  coutf				}
				void E(void)	                        	//E→T E'
				{	
					if(t.code=='i'||t.code=='x'||t.code=='y'||t.code=='(')
					{
						T( );E1( );
					}
					else
					{
						coutf					}
				}
				void main(void)
				{
					cinf>>t.code>>t.val;coutf					E( );
					if(t.code=='#')
						coutf					else
						coutf				}