suanfu.cpp

编写一个程序

#include<iostream.h>

void main()
{
	cout<<"请输入文法G:" <<endl;
	cout<<"S->aAcBe       A ->Ab|b        B ->d"<<endl<<endl;
	cout<<"该文法中非终结符的FIRSTVT集为:"<<endl;
	cout<<"FIRSTVT(S)={a}"<<endl;
    cout<<"FIRSTVT(A)={b}"<<endl;  
    cout<<"FIRSTVT(B)={d}"<<endl<<endl;

	cout<<"该文法中非终结符的LASTVT集为:"<<endl;
	cout<<"LASTVT(S)={e}"<<endl;
    cout<<"LASTVT(A)={b}"<<endl;
    cout<<"LASTVT(B)={d}"<<endl<<endl;



	cout<<"该文法的算符优先关系表为:"<<endl;
	cout<<"      "<<"a"<<"    "<<"b"<<"    "<<"c"<<"    "<<"d"<<"    "<<"e"<<endl<<endl;
	cout<<"a"<<"          "<<"<"<<"    "<<"="<<endl;
	cout<<"b"<<"          "<<">"<<"    "<<">"<<endl;
	cout<<"c"<<"                    "<<"<"<<"    "<<"="<<endl;
	cout<<"d"<<"                         "<<">"<<endl;
	cout<<"e"<<endl;
	
}