과제 - 재귀함수 계산기 만들기

재귀함수로 인터렉티브 계산기 만들기

//인터렉티브 계산기
#include <iostream>
#include <string>
#include <cstdlib>
#include <stack>


using namespace std;

float calculate(float currentHistory)
{
	char oper;
	float num;

	while (true)
	{
		cout << "연산자 입력(+, -, *, /):";
		cin >> oper;
			
		if (oper == 'p')
		{
			cout << "계산기 종료" << endl;
			exit(0);
		}
		if (oper == '+' || oper == '-' || oper == '*' || oper == '/')
			break; 
		cout << "잘못입력하셨습니다!" << endl;
	}
	cout << "숫자 입력: ";
	cin >> num;

	if (oper == '+')
		currentHistory += num;
	else if (oper == '-')
		currentHistory -= num;
	else if (oper == '*')
		currentHistory *= num;
	else if (oper == '/')
		currentHistory /= num;

	cout << currentHistory << endl;
	return calculate(currentHistory);	
}

float ImmediateTerminationCheck(const string& str)
{
	if (str == "p")
	{
		cout << "계산기 종료" << endl;
		exit(0);
	}

	try
	{
		return stof(str);
	}
	catch (...)
	{
		exit(0);
	}
}

int main()
{
	cout << "p 를 누르면 즉시 종료됩니다 " << endl;
	string firstInput;
	cout << "숫자 입력: ";
	cin >> firstInput;

	float firstNum = ImmediateTerminationCheck(firstInput);
	float result = calculate(firstNum);
	cout << result << endl;
	
}