Functions in c++,

1.  By:
 P.Divya,181602
 S.sandhiya,181611
 II B.SC maths [ca]
 S.B.K.college
 Aruppukottai
 TO:
 K.PADMA PRIYA M.Sc,M.Phil
 Asst proffesor
 Dept of maths ca
 S.B.K.college
 Arruppukottai


2. a function is a group of statements that
together perrform a task, function declaration
tells the complier about a functtion’s name ,
return type and parameters.A function
definition provides the actual body of the
function .The c++ standard library provides
numerous built in functions that our program
can call.

3.  Main()function is the entry point of any c++ program.When a c++
program is executed,the execution control goes directly to the main
()function .Every c++ program have a main()function.
 main()
 {
statements
}
If the main funtion has a return type. The syntax is
int main()
{
……….
……….
return 0;
}

4. Function prototyping is one very useful feature of
c++ function.Function prototype declaration
statement in the calling program
type function-name(argument-list);
Eg:
float volume (int a,int b,int c)
{
float v=a*b*c;
…….
…….
}

5.  The call by reference method of passing arguments to a function
copies the reference of an argument into the formal prameter.
 void swap(int a,int b)
 {
 int t= a;
 a=b;
 b=t;
 }
 Using pointers as follows
 void swap(int *a,int*b)
 {
 t=*a;
 *a=*b;
 *b=t;
 }

6. A c++ function can return a reference in a similar
way as it returns a pointer .
int & max(int&x,int&y)
{
if(x>y)
return x;
else
return y;
}

7.  Inline fun is a fun which when invoked requests the
compiler to replace the calling statement with its
body.A keyword inline is added before the fun name to
make it inline.
 inline function-header
 {
 function body
 }
 Eg;
 inline double cube(double a)
 {
 return (a*a*a);
 }

8. A default argument is a value provided in a
function declaration that is automatically
assigned by the compiler if the caller of the
function doesn’t provide a value for the
argument with a default value.

9. Function overloading (also method
overloading )is a programming concept that
allows programmers to define two or more
functions with the same name and in the same
scope .