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C PROGRAM
PRESENTATION
GGS INDRAPRASTHUNIVERSITY
Submitted to Submitted
by
Ms. Madhu Chauhan Manish
Assistant Professor 048
BCA E1 2016-2019

Topic
 Function-Definition, Need, Declaration,
Definition, Arguments, Return Value.

Function-Definition
 A function is a group of statements that together
perform a task. Every C program has at least
one function, which is main(), and all the most
trivial programs can define additional functions.
 A function declaration tells the compiler about a
function's name, return type, and parameters.

Need
 The C standard library provides numerous built-in
functions that your program can call. For
example, strcat() to concatenate two
strings, memcpy() to copy one memory location
to another location, and many more functions.
 No Need to copy code just call by its function
name

Function Arguments
 In programming, argument refers to the
variable passed to the function.
 Parameters a and b accepts the passed
arguments in the function definition. These
arguments are called formal parameters of the
function.

Syntax
#include<stdio.h>
#include<conio.h>
return_type function_name (parameter list);
{
local declaration;
Statements;
return statement;
}

Return Value
 The return statement terminates the execution of a
function and returns a value to the calling function.

Example
 Program to add two numbers with arguments and return value
#include<stdio.h>
#include<conio.h> //headers
Int sq(int num) //return type function name and argument
{
int ans;
ans=num*num; //statement
return(ans); //returning value of ans
}
void main()
printf(“Enter the number”);
scanf(“%d”,&num);
result=sq(num); //value of above program
printf(“%d”,result);
}

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Function-Definition, Need, Declaration, Definition, Arguments, Return Value

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