Добавить task3.cpp

task3.cpp

@@ -0,0 +1,70 @@
+#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;
+}