Добавить task4.cpp

task1-2.0.cpp

@@ -1,67 +0,0 @@
-#include <iostream>
-
-using namespace std;
-
-void sortArr(int* a, int n) {
-    for (int i = 1; i < n; i++) {
-        int key = a[i];
-        int j = i - 1;
-        while (j >= 0 && a[j] > key) {
-            a[j + 1] = a[j];
-            j--;
-        }
-        a[j + 1] = key;
-    }
-}
-void RemovableLmR(int* a, int& n) {
-    if (n <= 2) {
-        n = 0;
-        return;
-    }
-
-    // Зсуваємо масив вліво, видаляємо перший
-    for (int i = 0; i < n - 1; i++) {
-        a[i] = a[i + 1];
-    }
-
-    // Просто зменшуємо розмір ще на один, прибираємо останній
-    n = n - 2;
-}
-
-void printArr(int* a, int n) {
-    if (n == 0) {
-        cout << "(empty)\n";
-        return;
-    }
-    for (int i = 0; i < n; i++) {
-        cout << a[i] << " ";
-    }
-    cout << "\n";
-}
-
-int main() {
-    srand(time(0));
-    int n;
-    cout << "Enter N: ";
-    cin >> n;
-
-    int* a = new int[n];
-
-    for (int i = 0; i < n; i++) {
-        a[i] = rand() % 101 - 50;
-    }
-
-    cout << "\nOriginal array:\n";
-    printArr(a, n);
-
-    sortArr(a, n);
-    cout << "\nSorted array:\n";
-    printArr(a, n);
-
-    RemovableLmR(a, n);
-    cout << "\nArray after removing first and last:\n";
-    printArr(a, n);
-
-    delete[] a;
-    return 0;
-}

task1.cpp

@@ -1,50 +1,21 @@
-#include <iostream>
-using namespace std;
-
-void sortArr(int* p, int n) {
-    for (int i = 0; i < n - 1; i++) {
-        for (int j = 0; j < n - i - 1; j++) {
-            if (p[j] > p[j + 1]) {
-                int t = p[j];
-                p[j] = p[j + 1];
-                p[j + 1] = t;
-            }
-        }
-    }
-}
-
-void printArr(int* p, int n) {
-    for (int i = 0; i < n; i++) {
-        cout << p[i] << " ";
-    }
-    cout << "\n";
-}
-
-int main() {
-    srand(time(0));
-    int n;
-
-    cout << "Enter N: ";
-    cin >> n;
-
-    int* a = new int[n];
-
-    for (int i = 0; i < n; i++) {
-        a[i] = rand() % 101 - 50;
-    }
-
-    cout << "\nOriginal array:\n";
-    printArr(a, n);
-
-    sortArr(a, n);
-
-    cout << "\nSorted array:\n";
-    printArr(a, n);
-
-    cout << "\nArray without first and last elements:\n";
-    printArr(a + 1, n - 2);
-
-    delete[] a;
-    return 0;
-
-}
+#include <iostream>
+#define SIZE 80
+using namespace std;
+
+int main()
+{
+    char str[SIZE];
+    cout << "Input string: ";
+    cin.getline(str, SIZE);
+
+    int i = 0;
+    while (str[i] != '\0') {
+        if (str[i] == ' ') {
+            str[i] = '\t';
+        }
+        ++i;
+    }
+
+    cout << "Modified string: " << str << endl;
+    system("pause");
+}

task2.cpp

@@ -0,0 +1,53 @@
+#pragma warning(disable : 4996)
+#define SIZE 80
+#include <iostream>
+using namespace std;
+
+int mystrlen(const char* str) {
+    int len = 0;
+    for (; str[len] != '\0'; ++len) {}
+    return len;
+}
+
+char* mystrcat(char* str1, const char* str2) {
+    int i = mystrlen(str1);
+    int j;
+    for (j = 0; str2[j] != '\0'; ++j) {
+        str1[i + j] = str2[j];
+    }
+    str1[i + j] = '\0';
+    return str1;
+}
+
+char* mystrchr(char* str, char s) {
+    for (int i = 0; str[i] != '\0'; ++i) {
+        if (str[i] == s) {
+            return &str[i];
+        }
+    }
+    return 0;
+}
+
+int main() {
+    char str1[SIZE];
+    char str2[SIZE];
+    cout << "Input first string: ";
+    cin.getline(str1, SIZE);
+    cout << "Input second string: ";
+    cin.getline(str2, SIZE);
+
+    cout << "mystrlen(str1): " << mystrlen(str1) << endl;
+    cout << "mystrcat(str1, str2): " << mystrcat(str1, str2) << endl;
+
+    char ch;
+    cout << "Input char to search in str1: ";
+    cin >> ch;
+    char* f = mystrchr(str1, ch);
+    if (f) {
+        cout << "mystrchr(str1, '" << ch << "): " << f << endl;
+    }
+    else {
+        cout << "mystrchr(str1, '" << ch << "): 0" << endl;
+    }
+    system("pause");
+}

task3-2.0.cpp

@@ -1,85 +0,0 @@
-#include <iostream>
-using namespace std;
-
-int* Pos(int* a, int n, int& res_n) {
-    int* tmp = new int[3];
-    res_n = 0;
-    for (int i = 0; i < 3 && i < n; ++i)
-        if (a[i] > 0)
-            tmp[res_n++] = a[i];
-    int* res = new int[res_n];
-    for (int i = 0; i < res_n; ++i) res[i] = tmp[i];
-    delete[] tmp;
-    return res;
-}
-
-int* last3(int* a, int n, int& res_n) {
-    res_n = (n >= 3) ? 3 : n;
-    int* res = new int[res_n];
-    for (int i = 0; i < res_n; ++i)
-        res[i] = a[n - res_n + i];
-    return res;
-}
-
-int* min3(int* a, int n, int& res_n) {
-    int* tmp = new int[n];
-    for (int i = 0; i < n; ++i) tmp[i] = a[i];
-    for (int i = 0; i < n - 1; ++i)
-        for (int j = i + 1; j < n; ++j)
-            if (tmp[i] > tmp[j]) { int t = tmp[i]; tmp[i] = tmp[j]; tmp[j] = t; }
-    res_n = (n >= 3) ? 3 : n;
-    int* res = new int[res_n];
-    for (int i = 0; i < res_n; ++i) res[i] = tmp[i];
-    delete[] tmp;
-    return res;
-}
-
-typedef int* (*searchFunc)(int*, int, int&);
-
-void service(int* a, int n, searchFunc f) {
-    int res_n;
-    int* res = f(a, n, res_n);
-    cout << "Result: ";
-    for (int i = 0; i < res_n; ++i) cout << res[i] << " ";
-    cout << endl;
-    delete[] res;
-}
-
-int main() {
-    srand(time(NULL));
-    int n;
-    cout << "n(n>=3)= ";
-    cin >> n;
-    if (n < 3) {
-        cerr << "Error: size Array!!";
-        return 1;
-    }
-    int* arr = new int[n];
-    for (int i = 0; i < n; ++i)
-        arr[i] = rand() % 41 - 20;
-
-    cout << "Array: ";
-    for (int i = 0; i < n; ++i) cout << arr[i] << " ";
-    cout << endl;
-
-    searchFunc arrFunc[3] = { Pos, last3, min3 };
-
-    int choice;
-    do {
-        cout << "\nMenu:\n"
-            << "1) Array of the first 3 elements > 0\n"
-            << "2) Array of the last 3 elements\n"
-            << "3) Array of the 3 smallest elements\n"
-            << "4) Exit\n"
-            << "Select action (1-4): ";
-        cin >> choice;
-
-        if (choice >= 1 && choice <= 3)
-            service(arr, n, arrFunc[choice - 1]);
-        else if (choice != 4)
-            cout << "Incorrect choice!\n";
-    } while (choice != 4);
-
-    delete[] arr;
-    return 0;
-}

task3.cpp

@@ -1,70 +0,0 @@
-#include <iostream>
-using namespace std;
-
-void Pos(int* a, int n) {
-    int count = 0;
-    for (int i = 0; i < 3 && i < n; ++i)
-        if (a[i] > 0) ++count;
-    cout << "The number of the first 3 elements > 0: " << count << endl;
-}
-
-void Show1(int* a, int n) {
-    cout << "The last 3 elements: ";
-    for (int i = (n >= 3 ? n - 3 : 0); i < n; ++i)
-        cout << a[i] << " ";
-    cout << endl;
-}
-
-void Show2(int* a, int n) {
-    int* b = new int[n];
-    for (int i = 0; i < n; ++i) b[i] = a[i];
-
-    for (int i = 0; i < n-1; ++i)
-        for (int j = i+1; j < n; ++j)
-            if (b[i] > b[j]) { int t = b[i]; b[i] = b[j]; b[j] = t; }
-    cout << "The three smallest elements: ";
-    for (int i = 0; i < 3 && i < n; ++i) cout << b[i] << " ";
-    cout << endl;
-    delete[] b;
-}
-
-typedef void (*searchFunc)(int*, int);
-
-void service(int* a, int n, searchFunc f) {
-    f(a, n);
-}
-
-int main() {
-    srand(time(NULL));
-    int n;
-    cout << "n(n>=3)= ";
-    cin >> n;
-    if (n < 3) {
-        cerr << "Error: size Array!!";
-        return 1;
-    }
-    int* arr = new int[n];
-    for (int i = 0; i < n; ++i)
-        arr[i] = rand() % 41 - 20;
-
-    cout << "Array: ";
-    for (int i = 0; i < n; ++i) cout << arr[i] << " ";
-    cout << endl;
-
-    searchFunc arrFunc[3] = { Pos, Show1, Show2 };
-
-    cout << "Menu:\n"
-         << "1) The number of the first 3 elements > 0\n"
-         << "2) Show the last 3 items\n"
-         << "3) Display the 3 smallest elements\n"
-         << "Select an action (1-3): ";
-    int choice;
-    cin >> choice;
-    if (choice >= 1 && choice <= 3)
-        service(arr, n, arrFunc[choice-1]);
-    else
-        cout << "Incorrect choice!\n";
-
-    delete[] arr;
-    return 0;
-}

task4.cpp

@@ -0,0 +1,53 @@
+#pragma warning(disable : 4996)
+#define SIZE 80
+#include <iostream>
+using namespace std;
+
+int mystrlen(const char* str) {
+    int len = 0;
+    for (; str[len] != '\0'; ++len) {}
+    return len;
+}
+
+char* mystrcat(char* str1, const char* str2) {
+    int i = mystrlen(str1);
+    int j = mystrlen(str2);
+    for (int k = 0; k < j; ++k) {
+        str1[i + k] = str2[k];
+    }
+    str1[i + j] = '\0';
+    return str1;
+}
+
+char* mystrchr(char* str, char s) {
+    for (int i = 0; str[i] != '\0'; ++i) {
+        if (str[i] == s) {
+            return &str[i];
+        }
+    }
+    return 0;
+}
+
+int main() {
+    char str1[SIZE];
+    char str2[SIZE];
+    cout << "Input first string: ";
+    cin.getline(str1, SIZE);
+    cout << "Input second string: ";
+    cin.getline(str2, SIZE);
+
+    cout << "mystrlen(str1): " << mystrlen(str1) << endl;
+    cout << "mystrcat(str1, str2): " << mystrcat(str1, str2) << endl;
+
+    char ch;
+    cout << "Input char to search in str1: ";
+    cin >> ch;
+    char* f = mystrchr(str1, ch);
+    if (f) {
+        cout << "mystrchr(str1, '" << ch << "'): " << f << endl;
+    }
+    else {
+        cout << "mystrchr(str1, '" << ch << "'): 0" << endl;
+    }
+    system("pause");
+}