add: cpp-programming-ques 06_operator friend 12

Author: webwithaman

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
   "files.associations": {
+    "iomanip": "cpp",
     "iostream": "cpp"
   }
 }

06_operator_overloading_and_friend_function/12_overload_subscript.cpp

@@ -0,0 +1,98 @@
+// // Overload subscript operator [] that will be useful when we want to check for an index out of bound.
+
+// // Header files
+#include <iostream>
+#include <conio.h>
+#include <iomanip>
+
+// // use namespace
+using namespace std;
+
+// // define class Array
+class Array
+{
+
+private:
+    // // instance member variables
+    int a[5], size = 5;
+
+public:
+    // // constructors
+    Array() {}
+
+    // // instance member function to input matrix
+    void inputArray()
+    {
+        for (int i = 0; i < size; i++)
+        {
+            cin >> a[i];
+        }
+    }
+
+    // // instance member function to show matrix
+    void showArray()
+    {
+        for (int i = 0; i < size; i++)
+        {
+            cout << a[i];
+        }
+    }
+
+    // // instance member function to set element
+    void setElement(int index, int value)
+    {
+        if (index >= 0 && index < size)
+            a[index] = value;
+        else
+            cout << "\nInvalid Index...";
+    }
+
+    // // instance member function to get element
+    int getElement(int index, int value)
+    {
+        if (index >= 0 && index < size)
+            a[index] = value;
+        else
+            cout << "\nInvalid Index...";
+    }
+
+    // // overload subscript ([]) operator for reading element
+    int operator[](int index) const
+    {
+        if (index < 0 || index >= size)
+            cout << "\n!!! Invalid Index, Array Index Out of Bound...\n";
+
+        return a[index];
+    }
+
+    // // overload subscript ([]) operator for writing element
+    int &operator[](int index)
+    {
+        if (index < 0 || index >= size)
+            cout << "\n!!! Invalid Index, Array Index Out of Bound...\n";
+
+        return a[index];
+    }
+};
+
+// // Main Function Start
+int main()
+{
+
+    Array arr1; // // create object of Array class
+
+    // // input elements of array
+    cout << "\nEnter 5 Elements of Array => ";
+    for (int i = 0; i < 5; i++)
+        cin >> arr1[i];
+
+    // // show elements of array
+    cout << "\n>>>>>>>>>> Elements of Array Are <<<<<<<<<<<<\n";
+    for (int i = 0; i < 5; i++)
+        cout << arr1[i] << " ";
+
+    cout << endl; // Add new line
+    getch();
+    return 0;
+}
+// // Main Function End