#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Point {
public:
double x;
double y;
};
int main() {
Point pt1, pt2;
pt1.x = 8.5;
pt1.y = 0.0;
pt2.x = -4;
pt2.y = 2.5;
cout << "pt1=(" << pt1.x << ", " << pt1.y << ")\n";
cout << "pt2=(" << pt2.x << ", " << pt2.y << ")\n";
pt1 = pt2;
cout << "pt1=(" << pt1.x << ", " << pt1.y << ")\n";
cout << "pt2=(" << pt2.x << ", " << pt2.y << ")\n";
pt1.x = 0;
cout << "pt1=(" << pt1.x << ", " << pt1.y << ")\n";
cout << "pt2=(" << pt2.x << ", " << pt2.y << ")\n";
}
계좌만들기 벡터포함
class Account {
public:
string name;
int id;
double balance;
};
void add_account(vector<Account>& accts) {
string name;
int number;
double amount;
cout << "Enter name,account number, and account balance: ";
cin >> name >> number >> amount;
Account acct;
acct.name = name;
acct.id = number;
acct.balance = amount;
accts.push_back(acct);
}
void print_accounts(const vector<Account>& accts) {
int n = accts.size();
for (int i = 0; i < n; i++)
cout << accts[i].name << ", " << accts[i].id
<< ", " << accts[i].balance << '\n';
}
void swap(Account& er1, Account& er2) {
Account temp = er1;
er1 = er2;
er2 = temp;
}
bool less_than_by_name(const Account& e1, const Account& e2) {
return e1.name < e2.name;
}
bool less_than_by_id(const Account& e1, const Account& e2) {
return e1.id < e2.id;
}
bool less_than_by_balance(const Account& e1, const Account& e2) {
return e1.balance < e2.balance;
}
void sort(vector<Account>& db,
bool(*comp)(const Account&, const Account&)) {
int size = db.size();
for (int i = 0; i < size - 1; i++) {
int smallest = i;
for (int j = i + 1; j < size; j++)
if (comp(db[j], db[smallest]))
smallest = j;
if (smallest != i)
swap(db[i], db[smallest]);
}
}
int main() {
vector<Account> customers;
char cmd;
bool done = false;
do {
cout << "[A]dd [N]ame [I]D [B]alance [Q]uit == > ";
cin >> cmd;
switch (cmd) {
case 'A':
case 'a':
add_account(customers);
break;
case 'P':
case 'p':
print_accounts(customers);
break;
case 'N':
case 'n':
sort(customers, less_than_by_name);
print_accounts(customers);
break;
case'I':
case'i':
sort(customers, less_than_by_id);
print_accounts(customers);
break;
case 'B':
case 'b':
sort(customers, less_than_by_balance);
print_accounts(customers);
break;
case'Q':
case'q':
done = true;
break;
}
} while (!done);
}
계좌만들기
class Account {
string name;
int id;
double balance;
public:
Account(const string& customer_name, int account_number,
double amount) :
name(customer_name), id(account_number), balance(amount) {
if (amount < 0) {
cout << "Warning: negative account balance\n";
balance = 0.0;
}
}
void deposit(double amt) {
balance += amt;
}
bool withdraw(double amt) {
bool result = false;
if (balance - amt >= 0) {
balance -= amt;
result = true;
}
return result;
}
void display() {
cout << "Name: " << name << ",ID: " << id
<< ", Balance: " << balance << '\n';
}
};
int main() {
Account acct1("Joe", 2312, 1000.00);
Account acct2("Moe", 2400, 500.29);
acct1.display();
acct2.display();
cout << "---------------------" << "\n";
acct1.withdraw(800.00);
acct2.deposit(22.00);
acct1.display();
acct2.display();
}
Name: Joe,ID: 2312, Balance: 1000
Name: Moe,ID: 2400, Balance: 500.29
---------------------
Name: Joe,ID: 2312, Balance: 200
Name: Moe,ID: 2400, Balance: 522.29
numerator & denominator
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class SimpleRational {
int numerator;
int denominator;
public:
SimpleRational(int n, int d) : numerator(n), denominator(d) {
if (d == 0) {
cout << "Zero denominator error \n";
exit(1);
}
}
//default constructor makes a zero rational number 0/1
SimpleRational():numerator(0),denominator(1){}
void set_numerator(int n) {
numerator = n;
}
void set_dominator(int d) {
if (d != 0)
denominator = d;
else {
cout << "Zero denominator error \n";
exit(1);
}
}
int get_numerator() {
return numerator;
}
int get_denominator() {
return denominator;
}
};
SimpleRational multiply(SimpleRational f1, SimpleRational f2) {
return { f1.get_numerator() * f2.get_numerator(),
f1.get_denominator() * f2.get_denominator() };
}
void print_fraction(SimpleRational f) {
cout << f.get_numerator() << "/" << f.get_denominator();
}
int main() {
SimpleRational fract(1, 2);
cout << "The fraction is ";
print_fraction(fract);
cout << "\n";
fract.set_numerator(19);
fract.set_dominator(4);
cout << "The fraction now is ";
print_fraction(fract);;
cout << '\n';
SimpleRational fract1(1, 2), fract2(2, 3);
auto prod = multiply(fract1, fract2);
cout << "The product of ";
print_fraction(fract1);
cout << " and ";
print_fraction(fract2);
cout << " is ";
print_fraction(prod);
cout << "\n";
}
>>>
The fraction is 1/2
The fraction now is 19/4
The product of 1/2 and 2/3 is 2/6
해당 자료는 경희대학교 소프트웨어융합학과 배성호교수님 수업내용을 참조하였습니다.
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