What is an Array of Objects?
An array of objects is a data structure that stores a collection of objects of the same type. The objects in the array are stored in contiguous memory locations, and the array provides indexed access to the objects. This means that you can access an individual object in the array using its index, just like you would with an array of primitive data types (e.g., int, float, etc.).
How to create an Array of Objects in the Stack memory?
To create an array of objects on the stack in C++, you can use the following syntax:
Type name[size];
Here, ‘Type‘ is the type of the objects in the array (e.g., int, float, MyClass, etc.); ‘name‘ is the name of the array, and size is the number of elements in the array.
For example:
int array[10]; // Creates an array of 10 integers
MyClass objects[20]; // Creates an array of 20 objects of type MyClass
Issues while creating an Array of Objects in Stack memory:
Keep in mind that creating an array of objects on the stack has some limitations.
- The size of the array must be a compile-time constant,
- The array is stored in the stack, which has limited space. If you need to store a large number of objects or if the size of the array is not known at compile time, you may want to consider using a dynamic array or creating the objects on the heap using new.
Algorithm:
Here is a simple algorithm that creates an array of n objects of type MyClass on the stack and initializes each object with a value val:
- Define a variable array of type MyClass.
- Iterate through the elements of the array.
- For each element i, do the following:
- Call the default constructor of MyClass to create a new object in array[i].
- Set the value of array[i] to val.
Below is the implementation of the above approach.
C++
// C++ code to generate array of object in stack memory#include <bits/stdc++.h>using namespace std;// User defined classclass MyClass {public: // Default constructor MyClass() {} // Setter function void setValue(int val) { value = val; } // Getter function int getValue() const { return value; }private: // Data member to store the value int value;};// Driver codeint main(){ // Number of objects const int n = 5; // Value to initialize the objects with const int val = 10; // Create an array of n objects on the stack MyClass array[n]; // Initialize each object with the value val for (int i = 0; i < n; i++) { array[i].setValue(val); } // Print the value of each object for (int i = 0; i < n; i++) { cout << "Object " << i << ": " << array[i].getValue() << endl; } return 0;} |
Python3
# Python code to generate array of objects in stack memory# User defined classclass MyClass: # Default constructor def __init__(self): self.value = None # Setter function def setValue(self, val): self.value = val # Getter function def getValue(self): return self.value# Driver codeif __name__ == '__main__': # Number of objects n = 5 # Value to initialize the objects with val = 10 # Create an array of n objects array = [MyClass() for _ in range(n)] # Initialize each object with the value val for i in range(n): array[i].setValue(val) # Print the value of each object for i in range(n): print("Object", i, ":", array[i].getValue())# this code is contributed by dev |
Java
import java.util.Arrays;class MyClass { private int value; // Default constructor public MyClass() {} // Setter function public void setValue(int val) { value = val; } // Getter function public int getValue() { return value; }}public class Main { public static void main(String[] args) { // Number of objects final int n = 5; // Value to initialize the objects with final int val = 10; // Create an array of n objects on the stack MyClass[] array = new MyClass[n]; // Initialize each object with the value val for (int i = 0; i < n; i++) { array[i] = new MyClass(); array[i].setValue(val); } // Print the value of each object for (int i = 0; i < n; i++) { System.out.println("Object " + i + ": " + array[i].getValue()); } }} |
C#
using System;// User defined classclass MyClass{ private int value; // Default constructor public MyClass() { } // Setter function public void SetValue(int val) { value = val; } // Getter function public int GetValue() { return value; }}class Program{ static void Main(string[] args) { // Number of objects const int n = 5; // Value to initialize the objects with const int val = 10; // Create an array of n objects on the stack MyClass[] array = new MyClass[n]; // Initialize each object with the value val for (int i = 0; i < n; i++) { array[i] = new MyClass(); array[i].SetValue(val); } // Print the value of each object for (int i = 0; i < n; i++) { Console.WriteLine("Object " + i + ": " + array[i].GetValue()); } Console.ReadLine(); }}// Explanation:// This C# code generates an array of n objects of the MyClass type, and initializes each object with the value val.// It then prints the value of each object in the array.// To do this, we create a new instance of the MyClass type for each object in the array, and then set the value of the object using the SetValue method. We then print the value of each object using the GetValue method.// The const keyword is used to declare the n and val variables, which are constants and cannot be modified once set. |
Javascript
// Javascript code to generate array of object in stack memory// User defined classclass MyClass { constructor() { // Data member to store the value this.value = 0; } // Setter function setValue(val) { this.value = val; } // Getter function getValue() { return this.value; }}// Number of objectsconst n = 5;// Value to initialize the objects withconst val = 10;// Create an array of n objects on the stackconst array = new Array(n).fill(null).map(() => new MyClass());// Initialize each object with the value valfor (let i = 0; i < n; i++) { array[i].setValue(val);}// Print the value of each objectfor (let i = 0; i < n; i++) { console.log(`Object ${i}: ${array[i].getValue()}`);} |
Output
Object 0: 10 Object 1: 10 Object 2: 10 Object 3: 10 Object 4: 10
Output:
Output of the previous code
Auxiliary space: O(n)
time complexity: O(n)
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