[C++]func_pointer_example

func_ptr_ex.cpp

#include <iostream>

using namespace std;

int sum(int a,int b);
int subtract(int a,int b);
int multi(int a,int b);
int divide(int a,int b);

int(*p[4])(int x,int y) = {sum, subtract, multi, divide};

int main()
{
	int result;
	int num1, num2, oper;
	
	cout << "두 수를 입력하세요 : " ;
	cin >> num1 >> num2;
	cout << "0: 더하기, 1: 빼기, 2: 곱하기, 3: 나누기 " << endl;
	
	do
	{
		cout << "연산을 선택하세요 : ";
		cin >> oper; 
    } while (oper<0 || oper>3);
    
    result = (*p[oper])(num1, num2);
    cout << "연산 결과 : " << result << endl;
	
	return 0;	 
}

int sum(int a,int b)
{
	return a+b;
}

int subtract(int a,int b)
{
	return a-b;
}

int multi(int a,int b)
{
	return a*b;
}

int divide(int a,int b)
{
	if(a!=0 && b!=0){
		return a/b;
	} else return 0;
	
}