Initialize Array

C

// Syntax
dataType *arrayName = (dataType *)malloc(size * sizeof(dataType));
for (int i = 0; i < size; ++i) {
    arrayName[i] = newValue;
}

// Example
int *numbers = (int *)malloc(size * sizeof(int));
for (int i = 0; i < size; ++i) {
    umbers[i] = i * 2;
}

• malloc(size * sizeof(dataType)): malloc is a function in C that allocates a block of memory of size. size * sizeof(dataType) bytes, where size is the number of elements in the array, and sizeof(dataType) gives the size of each element in bytes.

C++

// Syntax
std::vector<int> arrayName;
arrayName.push_back(newValue);

// Example
std::vector<int> numbers;
numbers.push_back(3);

• std::vector<int> arrayName; initializes an empty dynamic array of integers.
• push_back() is a member function of the std::vector container in C++. It's used to add an element to the end of the vector.

Java

// Syntax
ArrayList<dataType> arrayListName = new ArrayList<>();
arrayListName.add(newValue);

// Example
ArrayList<Integer> numbers = new ArrayList<>();
numbers.add(3);

• .add() is a method of the ArrayList class in Java. It's used to append an element with the specified value to the end of the ArrayList.

Python

# Syntax
from array import array
integer_array = array('Datatype', [values])
integer_array.append(new_value)

# Example
from array import array
integer_array = array('i', [1, 2, 3, 4, 5])
integer_array.append(3)

In Python, the primary way to create an array-like structure is to use a list. If you specifically need to use an array, you can use the array module in Python.

• 'i' is the typecode for signed integers.
• The second argument to array is the iterable used to initialize the array.
• The append method is used to add elements in the last index