main.cpp

this a good book.

#include <iostream.h>


typedef double (*FUN)(double,double);

double fun(FUN* fp,int index,double i,double j)
{

}

double Add(double i,double j)
{
	return i+j;
}
double Dec(double i,double j)
{
	return i-j;
}
double Mul(double i,double j)
{
	return i*j;
}
double Power(double i,double j)
{
	double result=1;
	for(double k=0;k<j; k++)
	{
		result*= i;
	}
	return result;
}
void main()
{
	FUN fp[4];
	fp[0] = Add;
	fp[1] = Dec;
	fp[2] = Mul;
	fp[3] = Power;

	do {
			cout<<"Input [0] = Add"<<endl;
			cout<<"Input [1] = Dec"<<endl;
			cout<<"Input [2] = Mul"<<endl;
			cout<<"Input [3] = Power"<<endl;
			cout<<"Input other QUIT"<<endl;

			int number;
			cout<<"please input fun: "<<endl;
			cin>>number;
			if(number>3|| number<0)
			{
				cout<<"input Error, Quit";
				return;
			}
			double i,j;
			cout<<"please input two number: "<<endl;
			cin>>i>>j;

			cout<<"result  = "<<fun(fp,number,i,j)<<endl<<endl;

	} while(1);

	return;
}