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Funcsc++Part 1t.abdulmalik

The document discusses functions in C++. It defines what a function is, lists advantages of functions, describes different types of functions including built-in and user defined, explains the general syntax of a function, and provides examples of function prototypes, function calls, and different categories of functions based on return values and parameters.

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42 views11 pages

Funcsc++Part 1t.abdulmalik

The document discusses functions in C++. It defines what a function is, lists advantages of functions, describes different types of functions including built-in and user defined, explains the general syntax of a function, and provides examples of function prototypes, function calls, and different categories of functions based on return values and parameters.

Uploaded by

afmis1652
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UNIT2 :

Introduction to functions in C+++


Adjectives of this unit
- What is functions?
- Advantages of functions?
- Type of functions?
- General Syntax of a Function.
- What is function overloading ?

T.SUB: Abdulmalik A Alsarori


Functions
 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.
 Function declaration tells the compiler about
a function's name, return type, and
parameters.
 Function definition provides the actual body
of the function.
Advantages Of Functions
 Support for modular programming.
 Reduction in program size.
 Code duplication is avoided.
 Code reusability is provided.
 Functions can be called repetitively.
 A set of functions can be used to form
libraries.
Types Of Function
 There are two type of function :
 Built in functions :-
- part of compiler package.
- part of standard library made available by
compiler.
- can be used in any program by including
respective header file.
 User defined functions:-
- Created by user or programmer.
- Created as per requirement of the program.
General Syntax of a Function
 Syntax :

return_type function_name( parameter1 ... parameterN )


{
body of function
}
 The “return type” indicates what kind of data this function
returns, if any. Example: int
 Keyword “void” expressly states that this function does not
return any value. ( Some languages would call this a
“subroutine”. )
 If the return type is omitted, some compilers may assume
some type. This is a bad idea.
Sample Function
 int add( int a , int b )
{
int sum;
sum = a + b;
return sum;
}
Function prototype
 A function prototype is a declaration of a
function that tells the program about the
type of value returned by the function,
name of function, number and type of
arguments.
Function call
Function call
Function categories
 Function with no return value and no argument.
void add(void);
 Function with arguments passed and no return
value. void add(int,int);
 Function with no arguments but returns a value.
int add(void);
 Function with arguments and returns a value.
int add(int,int);
Function will not return any value but passes argument

 ii. Function will not return any value but passes


#include<iostream.h>
void add(int x,int y)
{
int c;
c=x+y;
cout<<“addition is”<<c;
}
int main()
{
int a,b;
cout<<“enter values of a and b”<<endl;
cin>>a>>b;
add(a,b);
return 0;
}

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