1. FUNCTION

2. Same task in repetition
What is FUNCTION ?
It is self contain block of statement
that
perform
Same task in repetition

3. Collection of Function creates a
C FUNCTION contains set of instructions enclosed by “{ }” which perform specific operation in c program.
C Program
Function
Collection of Function creates a
C Program

4. Uses :- FUNCTION Avoid rewriting same logic/code again & again
No limit in calling function to make use of it
We can call functions any no. of times & from any place in a program
Dividing a big task into small pieces
Function have
re-usability
FUNCTION

5. Function Declaration :-
Return_type function_name(argument list);
This informs complier about Function name , Function parameters and return value’s data type

6. This call the actual function
Function call :-
Function_name (argument list);
This call the actual function

9. Output

10. Types of FUNCTION
FUNCTION
Library Function
User Defined Function

11. How to call FUNCTION in a program ?
Call by value
Call by reference

12. All FUNCTION can be called either with arguments or without arguments in c program . And also these Function may or may not return value to the calling function.

13. FUNCTION with no argument & no return value
FUNCTION with argument & no return value
FUNCTION with argument & with return value

14. FUNCTION with no argument & no return value

16. Output

17. FUNCTION with argument & no return value

19. Output

20. FUNCTION with argument & with return value

22. Output