대학교 수업/C++ 프로그래밍
[C++] 명품 C++ 프로그래밍 6장
Jongung
2022. 6. 7. 00:46
실습문제
1번
#include <iostream>
using namespace std;
int add(int *a, int size, int *b = NULL) {
int sum = 0;
for (int i = 0; i < size; i++) {
sum += a[i];
}
if (b != NULL) {
for (int i = 0; i < size; i++) {
sum += b[i];
}
}
return sum;
}
int main() {
int a[] = { 1,2,3,4,5 };
int b[] = { 6,7,8,9,10 };
int c = add(a, 5);
int d = add(a, 5, b);
cout << c << endl;
cout << d << endl;
}
2번
#include <iostream>
#include <string>
using namespace std;
class Person {
int id;
double weight;
string name;
public:
Person(int id = 1, string name = "Grace", double weight = 20.5) {
this->id = id;
this->name = name;
this->weight = weight;
}
void show() { cout << id << ' ' << weight << ' ' << name << endl; }
};
int main() {
Person grace, ashley(2, "Ashley"), helen(3, "Helen", 32.5);
grace.show();
ashley.show();
helen.show();
}
3번
#include <iostream>
#include <string>
using namespace std;
int big(int a, int b, int c = 100) {
return (a > b ? a : b) < c ? (a > b ? a : b) : c;
}
int main() {
int x = big(3, 5);
int y = big(300, 60);
int z = big(30, 60, 50);
cout << x << ' ' << y << ' ' << z << endl;
return 0;
}
4번
#include <iostream>
#include <string>
using namespace std;
class MyVector {
int* mem;
int size;
public:
MyVector(int n, int val);
~MyVector() { delete[] mem; }
void show();
};
MyVector::MyVector(int n = 100, int val = 0) {
mem = new int[n];
size = n;
for (int i = 0; i < size; i++) mem[i] = val;
}
void MyVector::show() {
for (int i = 0; i < size; i++) {
cout << mem[i] << ' ';
}
cout << endl;
}
int main() {
MyVector one, two(50, 1);
one.show();
two.show();
}
5번
#include <iostream>
#include <string>
using namespace std;
class ArrayUtility {
public:
static void intToDouble(int source[], double dest[], int size);
static void doubleToInt(double source[], int dest[], int size);
};
void ArrayUtility::intToDouble(int source[], double dest[], int size) {
for (int i = 0; i < size; i++) {
dest[i] = (double)source[i];
}
}
void ArrayUtility::doubleToInt(double source[], int dest[], int size) {
for (int i = 0; i < size; i++) {
dest[i] = (int)source[i];
}
}
int main() {
int x[] = { 1,2,3,4,5 };
double y[5];
double z[] = { 9.9, 8.8, 7.7, 6.6, 5.6 };
ArrayUtility::intToDouble(x, y, 5);
for (int i = 0; i < 5; i++)cout << y[i] << ' ';
cout << endl;
ArrayUtility::doubleToInt(z, x, 5);
for (int i = 0; i < 5; i++)cout << x[i] << ' ';
cout << endl;
}
6번
#include <iostream>
#include <string>
using namespace std;
class ArrayUtility2 {
public:
static int* concat(int s1[], int s2[], int size);
static int* remove(int s1[], int s2[], int size, int& retSize);
};
int* ArrayUtility2::concat(int s1[], int s2[], int size) {
int* ret = new int[size];
int ind = 0;
cout << "합친 정수 배열을 출력한다." << endl;
for (int i = 0; i < size / 2; i++) {
ret[ind] = s1[i];
cout << ret[ind] << ' ';
ind++;
}
for (int i = 0; i < size / 2; i++) {
ret[ind] = s2[i];
cout << ret[ind] << ' ';
ind++;
}
cout << endl;
return ret;
}
int* ArrayUtility2::remove(int s1[], int s2[], int size, int& retSize) {
int cnt = 0;
int* tmp = new int[size];
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (s1[i] == s2[j]) break;
if (j == size-1) tmp[cnt++] = s1[i];
}
}
if (cnt == 0) return NULL;
retSize = cnt;
cout << "배열 x[]에서 y[]를 뺀 결과를 출력한다. 개수는 " << retSize << endl;
int* ret = new int[retSize];
for (int i = 0; i < retSize; i++) {
ret[i] = tmp[i];
cout << ret[i] << ' ';
}
cout << endl;
return ret;
}
int main() {
int x[5], y[5], retSize;
int* z, * w;
cout << "정수를 5개 입력하라. 배열 x에 삽입한다>>";
for (int i = 0; i < 5; i++) {
cin >> x[i];
}
cout << "정수를 5개 입력하라. 배열 y에 삽입한다>>";
for (int i = 0; i < 5; i++) {
cin >> y[i];
}
z = ArrayUtility2::concat(x, y, 10);
w = ArrayUtility2::remove(x, y, 5, retSize);
}
7번
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
class Random {
public:
static void seed() { srand((unsigned)time(0)); }
static int nextInt(int min = 0, int max = 32767);
static char nextAlphabet();
static double nextDouble();
};
int Random::nextInt(int min, int max) {
return rand() % (max - min) + min;
}
char Random::nextAlphabet() {
if (rand() % 2 == 0) return rand() % 26 + 'a';
else return rand() % 26 + 'A';
}
double Random::nextDouble() {
return (double)rand() / RAND_MAX;
}
int main() {
cout << "1에서 100까지 랜덤한 정수 10개를 출력합니다" << endl;
for (int i = 0; i < 10; i++) {
cout << Random::nextInt(1, 100) << ' ';
}
cout << endl;
cout << "알파벳을 랜덤하게 10개 출력합니다" << endl;
for (int i = 0; i < 10; i++) {
cout << Random::nextAlphabet() << ' ';
}
cout << endl;
cout << "랜덤한 실수 10개를 출력합니다" << endl;
for (int i = 0; i < 10; i++) {
cout << Random::nextDouble() << ' ';
}
cout << endl;
}
8번
#include <iostream>
#include <string>
using namespace std;
class Trace{
public:
static int idx;
static string t[100][2];
static void put(string a, string b);
static void print(string word="");
};
string Trace::t[100][2] = {""};
int Trace::idx = 0;
void Trace::put(string a, string b){
t[idx][0] = a;
t[idx][1] = b;
idx++;
}
void Trace::print(string word){
if(word == ""){
cout << "----- 모든 Trace 정보를 출력합니다. -----" << endl;
for(int i = 0; i < idx; i++){
cout << t[i][0] << " : " << t[i][1] << endl;
}
}
else{
cout << "----- "<< word << "태그의 Trace 정보를 출력합니다. -----" << endl;
for(int i = 0; i < idx; i++){
if(t[i][0].compare(word) == 0){
cout << t[i][0] << ":" << t[i][1] << endl;
}
}
}
}
void f(){
int a, b, c;
cout << "두 개의 정수를 입력하세요 >>";
cin >> a >> b;
Trace::put("f()", "정수를 입력 받았음");
c = a + b;
Trace::put("f()", "합 계산");
cout << "합은" << c << endl;
}
int main(){
Trace::put("main()", "프로그램 시작합니다.");
f();
Trace::put("main()", "종료");
Trace::print("f()");
Trace::print();
}
9번
#include <iostream>
using namespace std;
class Board{
public:
static string *boards;
static int idx;
static void add(string word);
static void print();
};
string* Board::boards = new string[100];
int Board::idx = 0;
void Board::add(string word){
boards[idx] = word;
idx ++;
}
void Board::print(){
cout << "********** 게시판입니다. **********";
cout << endl;
for(int i = 0; i < idx; i++){
cout << i << ": " << boards[i] << endl;
}
}
int main() {
Board::add("중간고사는 감독 없는 자율 시험입니다.");
Board::add("코딩 라운지 많이 이용해 주세요.");
Board::print();
Board::add("진소린 학생이 경진대회 입상하였습니다. 축하해주세요");
Board::print();
}