Добавить task3-2.0.cpp

task3-2.0.cpp

@@ -0,0 +1,85 @@
+#include <iostream>
+using namespace std;
+
+int* first3Pos(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] = { first3Pos, 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;
+}