What is iostream header file?

iostream header file use in C++ program for input and output functions.iostream use the object like cin ,cout ,cerr and clog to send data to and from the standard streams input, output, error (unbuffered), and log (buffered) respectively.

             Example;
                  
                           #include<iostream.h>
                                 
                          void main( )
                            {
                                 int a;
                                 cout<<"Enter number";
                                 cin>>a;
                             }
Here we use cout for print output and cin for input.

Collision Resolution Methods Chaining Probing Linear Probing , Quadratic Probing

What is collision hashing?

What is a Hash Table?

HASH Table

A hash table is made up of two parts: an array (the actual table where the data to be searched is stored) and a mapping function, known as a hash function. 

HASH Table is a speedy operation to

(1):Store,

(2):Retrieve

(3):Delete

Hash Function Computes the keys(input values) to generate index:

 

Division Method

key (input)% no. of slots in array = index

Consider an example:

If key is 44  then

44 % 5 = 4

Example

 

So the item 23 will be stored at index 3

Q:What would happen if 2 values comes on the same index ?

If 2 values like 23 and 33 comes on the same index 3 then

 a collision will occur.