개발새발 IT

#include <iostream>

using namespace std;

void Swap_Ref(int &a, int &b) //매개변수는 함수가 호출되어야 초기화가 진행되는 변수들이다.

{

int temp = a;

a=b;

b=temp;

}

int main(void)

{

int value1 = 100;

int value2 = 200;

Swap_Ref(value1, value2);

cout << value1 << endl;

cout << value2 << endl;

return 0;

}

#include <iostream>

using namespace std;

void Swap(int* &a, int* &b)

{

int *temp = a;

a = b;

b = temp;

}

int main(void)

{

int a=10, b=20;

int *ptr1=&a;

int *ptr2=&b;

cout << ptr1 << " [before] " << ptr2 << endl;

cout << *ptr1 << " [before] " << *ptr2 << endl;

Swap(ptr1, ptr2);

cout << ptr1 << " [after] " << ptr2 << endl;

cout << *ptr1 << " [after] " << *ptr2 << endl;

return 0;

} 

-----Menu-----

1.계좌개설

2.입 금

3.출 금

4.잔액조회

5.모든계좌 정보 출력

6.프로그램 종료 

#include <iostream>

#include <cstring>

using namespace std;

const int accSize = 10;//최대 계좌수

const int adminPassword = 0000;//관리자 암호 설정

void Menu(void);//메뉴 출력

void MakeAccount(void);//계좌개설

void Deposit(void);//입금

void Withdraw(void);//출금

void Balance(void);//잔액조회

void allBalance(void);//모든계좌 정보조회

typedef struct

{

int accID;

char name[20];

int balance;

} Account;

Account accSave[accSize];

int accNum=0;

int main(void)

{

int select;

while(1)

{

Menu();

cout<<"선택 : ";

cin>>select;

cout<<endl;

switch(select)

{

case 1:

MakeAccount();

break;

case 2:

Deposit();

break;

case 3:

Withdraw();

break;

case 4:

Balance();

break;

case 5:

allBalance();

break;

case 6:

return 0;

default:

cout << "올바른 선택이 아닙니다." << endl;

}

}

return 0;

}

void Menu(void)

{

cout<<"-----Menu-----"<<endl;

cout<<"1.계좌개설"<<endl;

cout<<"2.입 금"<<endl;

cout<<"3.출 금"<<endl;

cout<<"4.잔액조회"<<endl;

cout<<"5.모든계좌 정보 출력"<<endl;

cout<<"6.프로그램 종료"<<endl;

}

void MakeAccount(void)

{

int id;

char name[20];

int money;

cout<<"[계좌개설]"<<endl;

cout<<"계좌ID : "; cin>>id;

cout<<"이 름 : "; cin>>name;

cout<<"입금액 : "; cin>>money;

cout<<endl;

accSave[accNum].accID = id;

strcpy(accSave[accNum].name, name);

accSave[accNum].balance = money;

accNum++;

}

void Deposit(void)

{

int id;

int money;

cout<<"[입  금]"<<endl;

cout<<"계좌ID : "; cin>>id;

cout<<"입금액 : "; cin>>money;

for(int i=0; i<accNum; i++)

{

if(accSave[i].accID == id)

{

accSave[i].balance += money;

cout<<"입금완료"<<endl;

return;

}

}

cout<<"잘못된 ID 입니다!"<<endl<<endl;

}

void Withdraw(void)

{

int id;

int money;

cout<<"[출  금]"<<endl;

cout<<"계좌ID : "; cin>>id;

cout<<"출금액 : "; cin>>money;

for(int i=0; i<accNum; i++)

{

if(accSave[i].accID == id)

{

if(accSave[i].balance < money)

{

cout<<"잔액이 부족합니다."<<endl;

return;

}

accSave[i].balance -= money;

cout<<"출금완료"<<endl;

return;

}

}

cout<<"잘못된 ID 입니다!"<<endl<<endl;

}

void Balance(void)

{

int id;

cout<<"[잔액조회]"<<endl;

cout<<"계좌ID : "; cin>>id;

for(int i=0; i<accNum; i++)

{

if(accSave[i].accID == id)

{

cout<< "ID : " << accSave[i].accID<<endl;

cout<< "이름 : "<<accSave[i].name<<endl;

cout<< "잔액 : "<<accSave[i].balance<<endl<<endl;

return;

}

}

cout<<"잘못된 ID 입니다!"<<endl<<endl;

}

void allBalance(void)

{

int confirm_password;

cout<<"[관리자 모드]"<<endl;

cout<<"Input the admin password : "; cin>>confirm_password;

if(accNum==0)

{

cout<<"Bank has no account..."<<endl<<endl;

return;

}

if(confirm_password == adminPassword)

{

for(int i=0; i<accNum; i++)

{

cout<< "ID : " << accSave[i].accID<<endl;

cout<< "이름 : "<<accSave[i].name<<endl;

cout<< "잔액 : "<<accSave[i].balance<<endl<<endl;

}

}

else

{

cout<<"You are not admin!!!"<<endl<<endl;

return;

}

}

#include <iostream>

using namespace std;

int value=100; //전역변수

void test(void)

{

int value=200; //지역변수

value+=100;

cout << "지역변수 value : " << value << endl;

::value+=100; //범위지정 연산자 (Scope Resolution Operator) :: 사용

cout << "전역변수 value : " << ::value << endl;

}

int main(void)

{

test();

return 0;

}