__what is array:-__

Array is a finite collection of homogeneous elements in contiguous memory locations. Here finite means fixed and finite size (Finite number of elements).

Homogenous means all elements are of same datatype .

Contiguous memory location means consecutive memory locations. i.e. the elements will be store in sequence one after another in memory.

Array are of multiple types:-

1. 1D- Array

2. 2D - Array

3. 3D-Array

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nD -Array

__1. 1D array (one dimensional array):-__ Declaration syntax of a one dimensional array is as follow:-

__a) declaration:-__**syntax:-**

**Data_type**

**Array_name**

**[Size];**

**Data_type:-**it specifies the type of elements that will be stored in the array.

**Array_name:-**Specify the name of array which user defined.

**Size:-**Specifies the number of elements in the array.

**Example:-**

**int arr[5];**

Here

**int**is the datatype of the array elements,**arr**is the name of the array and 5 is the size of the array.Let's say the base address of the array is 100 i.e. first element store at the address 100 in the memory then of this address of other elements are:-

**2.**

**float b[5];**

As we know that floating point number takes 4 byte to store one number. but it varies with the architecture and it is for 16 bit architecture .

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__Hackerearth Problems:-__

- Very Cool numbers | Hacker earth solution
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- connected components in the graph | hacker earth data structure
- odd one out || hacker earth problem solution
- Minimum addition | Hackerearth Practice problem
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__Hackerrank Problems:-__- Playing With Characters | Hackerrank practice problem solution
- Sum and Difference of Two Numbers | hackerrank practice problem solution
- Functions in C | hackerrank practice problem solution
- Pointers in C | hackerrank practice problem solution
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- Array Reversal | hackerrank practice problem solution
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- Calculate the Nth term | hackerrank practice problem solution

__Data structure:-__

- Program to find cycle in the graph
- Implementation of singly link list
- Implementation of queue by using link list
- Algorithm of quick sort
- stack by using link list
- program to find preorder post order and inorder of the binary search tree
- Minimum weight of spanning tree
- Preorder, inorder and post order traversal of the tree

__ MCQs:-__