__ What is function :-__

Function is a group of statement or instructions that are written with a purpose to perform a certain task whenever it is require.

Their are two type of function use in c programming-

1)Built-in function

2) user defined function

**1)Built-in function:- **

built-in function in c are provided with c -package and the definition of there function are already define and stored in **c-library**. The declaration of these building functions are given in header **(.h)** files.

**printrf()**- To print something on standard I/O.

**scanf()**- To read something from standard I/O.

**pow()**- To calculate the power of a number.

**strcat()**- To concatenate two strings.

__2)User define function:-__

These function are defined by the programmer for specific purpose to used in his program.

Example:- If you want to make a function 'sum' for adding two numbers then the syntax of this function is :-

__Advantage of using function :-__

(i) Modular programming :-

It is a programming paradigm that breaks down the bigger problem into smaller subproblem. these subproblem are solved separately and their solution are combined to solve the bigger problem.

(v)Facilitates reuse ability of codes.

__Recommended Post:__

__Key points:-__

- How to set limit in the floating value in python
- What is boolean data type
- How to print any character without using format specifier
- How to check that given number is power of 2 or not
- How to fix limit in double and floating numbers after dot (.) in c++
- How to print a double or floating point number in scientific notation and fixed notation
- How to take input a string in c
- How to reduce the execution time of program in c++.

__Cracking the coding interview:-__

__Array and string:-__

__Tree and graph:-__

__Hackerearth Problems:-__

- Very Cool numbers | Hacker earth solution
- Vowel Recognition | Hackerearth practice problem solution
- Birthday party | Hacker earth solution
- Most frequent | hacker earth problem solution
- program to find symetric difference of two sets
- cost of balloons | Hacker earth problem solution
- Chacha o chacha | hacker earth problem solution
- jadu and dna | hacker earth solution
- Bricks game | hacker earth problem
- Anti-Palindrome strings | hacker earth solution
- connected components in the graph | hacker earth data structure
- odd one out || hacker earth problem solution
- Minimum addition | Hackerearth Practice problem
- The magical mountain | Hackerearth Practice problem
- The first overtake | Hackerearth Practice problem

__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
- Conditional Statements in C | Hackerrank practice problem solution
- For Loop in C | hackerrank practice problem solution
- Sum of Digits of a Five Digit Number | hackerrank practice problem solution
- 1D Arrays in C | hackerrank practice problem solution
- Array Reversal | hackerrank practice problem solution
- Printing Tokens | hackerrank practice problem solution
- Digit Frequency | hackerrank practice problem solution
- 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:-__