Importance of functions in c

Answer 1

Based on execution

1. Iterative Function

2. Recursive Function

Based on Argument and return value

1. No argument No return value

2. With argument Without return value

3. With out argument without return value

4. With argument With return value

Answer 2

Functions facilitates the programmers to break a large programming problem into smaller problems each solving a part of the big problem. Each function is a complete unit. They can call each other to provide their services.

If a program is divided into functional parts, then each part may be independently coded and later combined into a single unit. This approach clearly results in a number of advantages.

1. It facilitates top-down modular programming.

2. Length of a program can be reduced by using functions.

3. Debugging is easier.

4. Reusability of function increases.

Answer 3

A function is a self-contained block of code that performs a particular task.

Once a function has been designed and packed,it can be treated as a "Black Box" that takes some data from the main program and returns a value.

The inner details of operation are invisible to the rest of the program.

All that the program knows about a function is: What goes in and what comes out.

Every C program can be Consider a set of statements.


C functions can be classified into 2 categories,namely ,library functions and user-defined functions.
main is an example of user-defined functions.
printf and scanf belong to the category of library functions.

sqrt,cos,strcat

The main distinction between these two categories is that library functions are not required to be written by a programmer whereas a user-defined function has to be developed by the user at the time of writing a program.

However, a user-defined function can later become a part of the C program library.

Answer 4

C does not have procedures, pascal has procedures. Therefor the is no answer to the question.

Answer 5

Function definiton syntax:

return_type fn_name(argument1, argument2,....argumentn)

{

_______________________

function body

_______________________

}