[C++] 명품 C++ Programming 개정판 7장 실습문제 풀이 (2025)

#include <iostream>#include <string>using namespace std;class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }Book& operator +=(int price) {this->price += price;return *this;}Book& operator -=(int price) {this->price -= price;return *this;}};int main() {Book a("청춘", 20000, 300), b("미래", 30000, 500);a += 500;b -= 500;a.show();b.show();return 0;}

#include <iostream>#include <string>using namespace std;class Book;Book& operator +=(Book& b, int price);Book& operator -=(Book& b, int price);class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }friend Book& operator +=(Book& b, int price);friend Book& operator -=(Book& b, int price);};Book& operator +=(Book& b, int price) {b.price += price;return b;}Book& operator -=(Book& b, int price) {b.price -= price;return b;}int main() {Book a("청춘", 20000, 300), b("미래", 30000, 500);a += 500;b -= 500;a.show();b.show();return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }bool operator ==(int price);bool operator ==(string title);bool operator ==(Book& b);};bool Book::operator ==(int price) {if (this->price == price) return true;else return false;}bool Book::operator ==(string title) {if (this->title.compare(title) == 0) return true;else return false;}bool Book::operator ==(Book& b) {if (this->title.compare(b.title) == 0&& this->price == b.price&& this->pages == b.pages) return true;else return false;}int main() {Book a("명품 C++", 30000, 500), b("고품 c++", 30000, 500);if (a == 30000)cout << "정가 30000원" << endl;if (a == "명품 C++")cout << "명품 C++ 입니다." << endl;if (a == b)cout << "두 책이 같은 책입니다." << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Book;bool operator ==(Book a, int price);bool operator ==(Book a, string title);bool operator ==(Book a, Book& b);class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }friend bool operator ==(Book a, int price);friend bool operator ==(Book a, string title);friend bool operator ==(Book a, Book& b);};bool operator ==(Book a, int price) {if (a.price == price) return true;else return false;}bool operator ==(Book a, string title) {if (a.title.compare(title) == 0) return true;else return false;}bool operator ==(Book a, Book& b) {if (a.title.compare(b.title) == 0&& a.price == b.price&& a.pages == b.pages) return true;else return false;}int main() {Book a("명품 C++", 30000, 500), b("고품 c++", 30000, 500);if (a == 30000)cout << "정가 30000원" << endl;if (a == "명품 C++")cout << "명품 C++ 입니다." << endl;if (a == b)cout << "두 책이 같은 책입니다." << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }bool operator !(){if (this->price == 0) return true;else return false;}};int main() {Book book("벼룩시장", 0, 50);if (!book) cout << "공짜다" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Book;bool operator < (string str, Book b);class Book {string title;int price, pages;public:Book(string title = "", int price = 0, int pages = 0) {this->title = title; this->price = price; this->pages = pages;}void show() {cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;}string getTitle() { return title; }friend bool operator < (string str, Book b);};bool operator < (string str, Book b) {if (str.compare(b.title) < 0) return true;else return false;}int main() {Book a("청춘", 20000, 300);string b;cout << "책 이름을 입력하세요>>";getline(cin, b);if (b < a)cout << a.getTitle() << "이 " << b << "보다 뒤에 있구나!" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Color {int red;int green;int blue;public:Color() :Color(0, 0, 0) {}Color(int r, int g, int b) {this->red = r; this->green = g; this->blue = b;}void show() {cout << red << ' ' << green << ' ' << blue << endl;}Color operator +(Color c) {Color tmp;tmp.red = this->red + c.red;tmp.green = this->green + c.green;tmp.blue = this->blue + c.blue;return tmp;}bool operator ==(Color c) {if (this->red == c.red && this->green == c.green && this->blue == c.blue) return true;else return false;}};int main() {Color red(255, 0, 0), blue(0, 0, 255), c;c = red + blue;c.show();Color fuchsia(255, 0, 255);if (c == fuchsia)cout << "보라색 맞음" << endl;elsecout << "보라색 아님" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Color;Color operator +(Color c1, Color c2);bool operator ==(Color c1, Color c2);class Color {int red;int green;int blue;public:Color() :Color(0, 0, 0) {}Color(int r, int g, int b) {this->red = r; this->green = g; this->blue = b;}void show() {cout << red << ' ' << green << ' ' << blue << endl;}friend Color operator +(Color c1, Color c2);friend bool operator ==(Color c1, Color c2);};Color operator +(Color c1,Color c2) {Color tmp;tmp.red = c1.red + c2.red;tmp.green = c1.green + c2.green;tmp.blue = c1.blue + c2.blue;return tmp;}bool operator ==(Color c1, Color c2) {if (c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue) return true;else return false;}int main() {Color red(255, 0, 0), blue(0, 0, 255), c;c = red + blue;c.show();Color fuchsia(255, 0, 255);if (c == fuchsia)cout << "보라색 맞음" << endl;elsecout << "보라색 아님" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Matrix {int m[2][2];public:Matrix() : Matrix(0, 0, 0, 0) {}Matrix(int m1, int m2, int m3, int m4) {m[0][0] = m1;m[0][1] = m2;m[1][0] = m3;m[1][1] = m4;}void show() {cout << "Matrix = { ";for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)cout << m[i][j] << ' ';cout << "}" << endl;}Matrix operator +(Matrix mat) {Matrix tmp;for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)tmp.m[i][j] = m[i][j] + mat.m[i][j];return tmp;}Matrix& operator +=(Matrix mat) {for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)m[i][j] += mat.m[i][j];return *this;}bool operator ==(Matrix mat) {for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)if (m[i][j] != mat.m[i][j]) return false;return true;}};int main() {Matrix a(1, 2, 3, 4), b(2, 3, 4, 5), c;c = a + b;a += b;a.show(); b.show(); c.show();if (a == c)cout << "a and c are the same" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Matrix;Matrix operator +(Matrix mat1, Matrix mat2);Matrix& operator +=(Matrix& mat1, Matrix mat2);bool operator ==(Matrix mat1, Matrix mat2);class Matrix {int m[2][2];public:Matrix() : Matrix(0, 0, 0, 0) {}Matrix(int m1, int m2, int m3, int m4) {m[0][0] = m1;m[0][1] = m2;m[1][0] = m3;m[1][1] = m4;}void show() {cout << "Matrix = { ";for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)cout << m[i][j] << ' ';cout << "}" << endl;}friend Matrix operator +(Matrix mat1, Matrix mat2);friend Matrix& operator +=(Matrix& mat1, Matrix mat2);friend bool operator ==(Matrix mat1, Matrix mat2);};Matrix operator +(Matrix mat1, Matrix mat2) {Matrix tmp;for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)tmp.m[i][j] = mat1.m[i][j] + mat2.m[i][j];return tmp;}Matrix& operator +=(Matrix &mat1, Matrix mat2) {for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)mat1.m[i][j] += mat2.m[i][j];return mat1;}bool operator ==(Matrix mat1, Matrix mat2) {for (int i = 0; i < 2; i++)for (int j = 0; j < 2; j++)if (mat1.m[i][j] != mat2.m[i][j]) return false;return true;}int main() {Matrix a(1, 2, 3, 4), b(2, 3, 4, 5), c;c = a + b;a += b;a.show(); b.show(); c.show();if (a == c)cout << "a and c are the same" << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Matrix {int m[4];public:Matrix() : Matrix(0, 0, 0, 0) {}Matrix(int m1, int m2, int m3, int m4) {m[0] = m1;m[1] = m2;m[2] = m3;m[3] = m4;}void show() {cout << "Matrix = { ";for (int i = 0; i < 4; i++)cout << m[i] << ' ';cout << "}" << endl;}void operator >>(int mat[4]) {for (int i = 0; i < 4; i++)mat[i] = m[i];}Matrix& operator <<(int mat[4]) {for (int i = 0; i < 4; i++)m[i] = mat[i];return *this;}};int main() {Matrix a(4, 3, 2, 1), b;int x[4], y[4] = { 1,2,3,4 };a >> x;b << y;for (int i = 0; i < 4; i++) cout << x[i] << ' ';cout << endl;b.show();return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Matrix;void operator >>(Matrix mat1, int mat2[4]);Matrix& operator <<(Matrix& mat1, int mat2[4]);class Matrix {int m[4];public:Matrix() : Matrix(0, 0, 0, 0) {}Matrix(int m1, int m2, int m3, int m4) {m[0] = m1;m[1] = m2;m[2] = m3;m[3] = m4;}void show() {cout << "Matrix = { ";for (int i = 0; i < 4; i++)cout << m[i] << ' ';cout << "}" << endl;}friend void operator >>(Matrix mat1, int mat2[4]);friend Matrix& operator <<(Matrix& mat1, int mat2[4]);};void operator >>(Matrix mat1, int mat2[4]) {for (int i = 0; i < 4; i++)mat2[i] = mat1.m[i];}Matrix& operator <<(Matrix &mat1,int mat2[4]) {for (int i = 0; i < 4; i++)mat1.m[i] = mat2[i];return mat1;}int main() {Matrix a(4, 3, 2, 1), b;int x[4], y[4] = { 1,2,3,4 };a >> x;b << y;for (int i = 0; i < 4; i++) cout << x[i] << ' ';cout << endl;b.show();return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Circle;Circle& operator ++(Circle &c);//전위 연산자Circle operator ++(Circle& c, int x);//후위 연산자class Circle {int radius;public:Circle(int radius = 0) { this->radius = radius; }void show() { cout << "radius = " << radius << " 인 원" << endl; }friend Circle& operator ++(Circle &c);friend Circle operator ++(Circle& c, int x);};Circle& operator ++(Circle &c) {c.radius++;return c;}Circle operator ++(Circle &c, int x) {Circle tmp = c;c.radius++;return tmp;}int main() {Circle a(5), b(4);++a;b = a++;a.show();b.show();return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Circle;Circle operator +(int r, Circle c);class Circle {int radius;public:Circle(int radius = 0) { this->radius = radius; }void show() { cout << "radius = " << radius << " 인 원" << endl; }friend Circle operator +(int r, Circle c);};Circle operator +(int r, Circle c) {Circle tmp;tmp.radius = r + c.radius;return tmp;}int main() {Circle a(5), b(4);b = 1 + a;a.show();b.show();return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Statistics {int* statistic;int size;public:Statistics(int size = 0) { this->size = size; this->statistic = new int[size]; }Statistics& operator <<(int x) {size++;Statistics tmp(size);for (int i = 0; i < size - 1; i++)tmp.statistic[i] = statistic[i];tmp.statistic[size - 1] = x;delete[] this->statistic;this->statistic = new int[size];for (int i = 0; i < size; i++)this->statistic[i] = tmp.statistic[i];return *this;}Statistics& operator ~() {for (int i = 0; i < size; i++)cout << statistic[i] << ' ';cout << endl;return *this;}Statistics& operator >>(int &avg) {int sum = 0;for (int i = 0; i < size; i++)sum += statistic[i];avg = sum / size;return *this;}bool operator !() {if (size == 0) return true;else return false;}};int main() {Statistics stat;if (!stat) cout << "현재 통계 데이터가 없습니다." << endl;int x[5];cout << "5개의 정수를 입력하라>>";for (int i = 0; i < 5; i++) cin >> x[i];for (int i = 0; i < 5; i++) stat << x[i];stat << 100 << 200;~stat;int avg;stat >> avg;cout << "avg=" << avg << endl;return 0;}

#include <iostream>#include <string>#include <cstring>using namespace std;class Stack {int s[100];int top;public:Stack() { top = -1; }bool operator !() {if (top == -1) return true;else return false;}Stack& operator<<(int x) {s[++top] = x;return *this;}Stack& operator>>(int &x) {x = s[top--];return *this;}};int main() {Stack stack;stack << 3 << 5 << 10;while (true) {if (!stack) break;int x;stack >> x;cout << x << ' ';}cout << endl;return 0;}

#include <iostream>#include <string>using namespace std;class SortedArray {int size;int* p;void sort();public:SortedArray();SortedArray(SortedArray& src);SortedArray(int p[],int size);~SortedArray();SortedArray operator +(SortedArray& op2);SortedArray& operator =(const SortedArray& op2);void show();};void SortedArray::sort() {int tmp;for (int i = 0; i < size; i++) {for (int j = 0; j < size - i - 1; j++) {if (p[j] > p[j + 1]) {tmp = p[j];p[j] = p[j + 1];p[j + 1] = tmp;}}}}SortedArray::SortedArray() {this->size = 0;this->p = NULL;}SortedArray::SortedArray(SortedArray& src) {this->size = src.size;this->p = new int[size];for (int i = 0; i < size; i++) {this->p[i] = src.p[i];}sort();}SortedArray::SortedArray(int p[], int size) {this->size = size;this->p = new int[size];for (int i = 0; i < size; i++) {this->p[i] = p[i];}sort();}SortedArray::~SortedArray() {delete[] p;}SortedArray SortedArray::operator +(SortedArray& op2) {SortedArray tmp;tmp.size = this->size + op2.size;tmp.p = new int[tmp.size];int ind = 0;for (int i = 0; i < this->size; i++) {tmp.p[ind++] = this->p[i];}for (int i = 0; i < op2.size; i++) {tmp.p[ind++] = op2.p[i];}sort();return tmp;}SortedArray& SortedArray::operator =(const SortedArray& op2) {delete[] this->p;this->size = op2.size;this->p = new int[this->size];for (int i = 0; i < size; i++) {this->p[i] = op2.p[i];}sort();return *this;}void SortedArray::show() {cout << "배열 출력 : ";for (int i = 0; i < size; i++) {cout << p[i] << ' ';}cout << endl;}int main() {int n[] = { 2,20,6 };int m[] = { 10,7,8,30 };SortedArray a(n, 3), b(m, 4), c;c = a + b;a.show();b.show();c.show();return 0;}