add: cpp-programming-ques 06_operator friend 13

Author: webwithaman

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
   "files.associations": {
-    "iomanip": "cpp",
-    "iostream": "cpp"
+    "new": "cpp",
+    "iostream": "cpp",
+    "ostream": "cpp"
   }
 }

06_operator_overloading_and_friend_function/13_overload_new_delete.cpp

@@ -0,0 +1,152 @@
+// // Create a student class and overload new and delete operators as a member function of the class.
+
+// // Header files
+#include <iostream>
+#include <conio.h>
+#include <string.h>
+
+// // use namespace
+using namespace std;
+
+// // define class Student
+class Student
+{
+public:
+    // // static member variables
+    static const unsigned int MAX_CHARS_NAME = 31;
+
+private:
+    // // instance member variables
+    char name[MAX_CHARS_NAME];
+    int roll;
+
+public:
+    // // constructors
+    Student() {}
+
+    Student(char *nm)
+    {
+        strcpy(name, nm);
+    }
+
+    Student(int r)
+    {
+        roll = r;
+    }
+
+    Student(char *nm, int r)
+    {
+        strcpy(name, nm);
+        roll = r;
+    }
+
+    Student(int r, char *nm)
+    {
+        strcpy(name, nm);
+        roll = r;
+    }
+
+    // // overloaded instance member function to set student's data
+    void setData(char *nm, int r)
+    {
+        strcpy(name, nm);
+        roll = r;
+    }
+
+    // // overloaded instance member function to set student's data
+    void setData(int r, char *nm)
+    {
+        strcpy(name, nm);
+        roll = r;
+    }
+
+    // // instance member function to show student's data
+    void showData()
+    {
+        cout << "Name => " << name << ", Roll no. => " << roll;
+    }
+
+    // // instance member function to set roll
+    void setRoll(int r)
+    {
+        roll = r;
+    }
+
+    // // instance member function to set name
+    void setName(char *nm)
+    {
+        strcpy(name, nm);
+    }
+
+    // // instance member function to get roll
+    int getRoll()
+    {
+        return roll;
+    }
+
+    // // instance member function to get name
+    char *getName(char *nm)
+    {
+        strcpy(nm, name);
+        return nm;
+    }
+
+    // // overload new operator
+    void *operator new(size_t size)
+    {
+        cout << "\n\nOverloaded new operator called with size: " << size << " bytes" << endl;
+        return ::operator new(size);
+    }
+
+    // // overload new[] operator
+    void *operator new[](size_t size)
+    {
+        cout << "\n\nOverloaded new operator called with size: " << size << " bytes" << endl;
+        return ::operator new(size);
+    }
+
+    // Overload delete operator
+    void operator delete(void *ptr)
+    {
+        cout << "\n\nOverloaded delete operator called." << endl;
+        ::operator delete(ptr);
+    }
+
+    // Overload delete[] operator
+    void operator delete[](void *ptr)
+    {
+        cout << "\n\nOverloaded delete operator called." << endl;
+        ::operator delete(ptr);
+    }
+};
+
+// // Main Function Start
+int main()
+{
+    char name[Student::MAX_CHARS_NAME];
+    int roll;
+
+    // // Get student's Data
+    cout << "\nEnter Student's Roll Number => ";
+    cin >> roll;
+
+    cout << "\nEnter Student's Name (MAX_CHARACTERS " << Student::MAX_CHARS_NAME - 1 << ") => ";
+    cin.ignore();
+    cin.getline(name, Student::MAX_CHARS_NAME);
+
+    Student *s1;
+    s1 = new Student(roll, name); // create object of Student dynamically
+
+    // // display students's data
+    cout << "\n>>>>>>>>>>>> Student's Data <<<<<<<<<<<\n"
+         << endl;
+    s1->showData();
+
+    // // deallocate memory of object s1
+    delete s1;
+
+    cout << endl; // Add new line
+    getch();
+    return 0;
+}
+// // Main Function End

06_operator_overloading_and_friend_function/13_overload_new_delete.exe

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <malloc.h>
+
+int main()
+{
+
+    int x;
+
+    int *ptr = malloc(4);
+
+    printf("\n%d\n", *ptr);
+}