[C++]클래스

[[연습문제 1]]

#include <iostream>

using std::cin; using std::cout; using std::endl;

class ACC
{
public:
 int accId;
 char pw[5];
 char name[20];
 int bal;

 void showdata();
 void deposit();
 void withdraw(); 
 
};

int main()
{
 ACC ac = {1111, "1234", "오세혁", 5000};
 
 ac.showdata();
 ac.deposit();
 ac.withdraw();
 ac.showdata();
 return 0;
}

void ACC::showdata()
{
 cout << "\n계좌번호 : " << accId << endl;
 cout << name << "회원님의 잔액은 " << bal << "입니다.\n";
}

void ACC::deposit()
{
 int inm;
 cout << "입금 금액 : ";
 cin >> inm;
 bal+=inm;
}

void ACC::withdraw()
{
 int outm;
 cout << "출금 금액 : ";
 cin >> outm;
 bal -= outm;
}

[[연습문제 2]]

#include <iostream>
using std::cin;
using std::cout;
using std::endl;

class Triangle
{
public:
 int base, height;
 void SetArea(int baset, int heightt);
 double GetArea();
};

int main()
{
 int base, height;
 cout << "\n ***  삼각형 넓이 구하기 ***\n\n";
 cout << "밑변 : ";
 cin >> base;
 cout << "높이 : ";
 cin >> height;

 Triangle tri;
 tri.SetArea(base, height);

 cout << "삼각형의 넓이는 " << tri.GetArea() << "입니다\n";

 return 0;
}

void Triangle::SetArea(int baset, int heightt)
{
 base = baset;
 height = heightt;
}

double Triangle::GetArea()
{
  return (base*height)/2.0; 
}

[[연습문제 3]]

#include <iostream>
using std::cin; using std::cout; using std::endl;

class Cal
{
public:
 int sum;
 void Init();
 void RangeSum(int num1, int num2);
 int GetrangeSum();
};
int main()
{
 int su1, su2;

 cout << "두 수를 입력 하시오 : ";
 cin >> su1 >> su2;

 Cal ca;
 ca.Init();
 ca.RangeSum(su1, su2);
 
 cout << endl << su1 << " ~ " << su2 << "의 합은 ["
  << ca.GetrangeSum() << "]입니다.\n";

 return 0;
}

void Cal::Init()
{
 sum =0;
}

void Cal::RangeSum(int num1, int num2)
{
 if (num1 > num2)
 {
  int temp;
  temp = num1;
  num1 = num2;
  num2 = temp;
 }
 for(int i = num1; i<=num2; i++)
 {
  sum += i;
 }
}

int Cal::GetrangeSum()
{
 return sum;
}