긴급갱킹050

#include <iostream>
using namespace std;

int main() {
	int *arr = new int[5];
	int tot = 0, avg = 0;
	cout << "정수 5개 입력>> ";
	for (int i = 0; i < 5; i++)
	{
		cin >> arr[i];
		tot += arr[i];
	}
	avg = tot / 5;
	cout << "평균 " << avg;
	delete[] arr;
	return 0;
}

/////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>
using namespace std;

int main() {
	int cnt = 0, index, atStr;
	string str;
	cout << "문자열 입력>> ";
	getline(cin, str);
	//at를 이용한 방법
	for (int i = 0; i < str.size(); i++) {
		if (str.at(i) == 'a') {
			cnt++;
		}
	}
	cout << "문자 a는 "<< cnt << "개 있습니다." << endl;
	//find를 이용한 방법
	cnt = 0;
	for (index = 0; index < str.size();) {
		if (str.find('a', index) != -1)
		{
			atStr = str.find('a', index) - index + 1;
			cnt++;
			index += atStr;
		} else {
			break;
		}

	}
	cout << "문자 a는 " << cnt << "개 있습니다." << endl;
	return 0;
}

////////////////////////////////////////////////////////////////////

#include <iostream>
using namespace std;

class Sample {
public:
	Sample(int n) {
		size = n; p = new int[n];
	};
	void read();
	void write();
	int big();
	~Sample();

private:
	int *p;
	int size;
};
void Sample::read() {
	for (int i = 0; i < size; i++)
	{
		cin >> p[i];
	}
}
void Sample::write() {
	for (int i = 0; i < size; i++)
	{
		cout << p[i] << " ";
	}
	cout << endl;
}
int Sample::big() {
	int max = p[0];
	for (int i = 1; i < size; i++)
	{
		if (max < p[i])
		{
			max = p[i];
		}
	}
	return max;
}
Sample::~Sample() {
	delete[] p;
}
int main() {
	Sample s(10);
	s.read();
	s.write();
	cout << "가장 큰 수는 " << s.big() << endl;
	return 0;
}

/////////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>
using namespace std;

int main() {
	string str;
	while (true)
	{
		cout << "아래에 한 줄을 입력하세요.(exit를 입력하면 종료합니다)" << endl << ">>";
		getline(cin, str);
		if (str == "exit")
		{
			break;
		}
		for (int i = str.size() - 1; i >= 0; i--)
		{
			cout << str.at(i);
		}
		cout << endl;
	}
}

//////////////////////////////////////////////////////////////////////////////////////

#include <iostream>
using namespace std;

class Circle
{
	int radius;
public:
	void setRadius(int radius) { this->radius = radius; };
	double getArea() { return 3.14*radius*radius; };
};


int main() {
	int input = 0, cnt = 0;
	Circle c1;
	Circle c2;
	Circle c3;
	cout << "원 1의 반지름 >> ";
	cin >> input;
	c1.setRadius(input);
	cout << "원 2의 반지름 >> ";
	cin >> input;
	c2.setRadius(input);
	cout << "원 3의 반지름 >> ";
	cin >> input;
	c3.setRadius(input);

	if (c1.getArea() > 100)
		cnt++;
	if (c2.getArea() > 100)
		cnt++;
	if (c3.getArea() > 100)
		cnt++;

	cout << "면적이 100보다 큰 원은 " << cnt << "개 입니다.";
	return 0;
}

///////////////////////////////////////////////////////////////////////////////////

#include <iostream>
using namespace std;

class Circle
{
	int radius;
public:
	void setRadius(int radius) { this->radius = radius; };
	double getArea() { return 3.14*radius*radius; };
};

class ArrCircle
{
	int size;
	int overHundred;
	Circle *cir;
public:
	ArrCircle(int size) {
		this->size = size;
		cir = new Circle[size];
	};
	int getSize() { return size; };
	void write();
	int getOverHundred();
	~ArrCircle() {
		delete[] cir;
	}
private:

};
void ArrCircle::write() {
	for (int i = 0; i < size; i++)
	{
		int tmp;
		cout << "원 "<< i+1 <<"의 반지름 >> ";
		cin >> tmp;
		cir[i].setRadius(tmp);
	}
}
int ArrCircle::getOverHundred() {
	overHundred = 0;
	for (int i = 0; i < size; i++)
	{
		if (cir[i].getArea() > 100)
		{
			overHundred++;
		}
	}
	return overHundred;
}
int main() {
	int input = 0, cnt = 0;
	cout << "원의 갯수 >> ";
	cin >> input;
	ArrCircle cirArr(input);
	cirArr.write();
	cout << "면적이 100보다 큰 원은 " << cirArr.getOverHundred() << "개 입니다.";
	return 0;
}