8/14/2019 C++ Functions

1/21

(Functions)++C

++C(Functions)

Function :

C++

function

function main

: -

1- .

2- .

3- .

4- .

5- .

6-

function function

8/14/2019 C++ Functions

2/21

.

:

:-

-12-

-34-

-56- .

6

Function 6 :

. -1

.

Function ::

Type-specified function-name (formal

parameters)

8/14/2019 C++ Functions

3/21

{function body}

-: Function

* in,: Pass by value* in & out ,: Pass by reference

* out,: Output parameters

:-

1- 2- 3- 4-

function .

Functions :-

Functions -1 built in ++C : Header File

:

8/14/2019 C++ Functions

4/21

cos(5); // 5 cos log(5); // 5 log

pow(4,2); // 42

sqrt(4); // 4

Header File

:#include

2- Functions

: ( (

:#includeint cube(int x){return x*x*x;}

void main(){cube(2);}

cube int

8/14/2019 C++ Functions

5/21

( ) int

x 3 .

2 cube main int

.

x ;( cube(2main

return return

.

run

:int c = cube(2);

c :

;(:cout

8/14/2019 C++ Functions

6/21

:

:#includefloat max(int x , float y){if(x > y)return x;return y;}

void main(){cout

8/14/2019 C++ Functions

7/21

Function ( return (

.

cube intmax.... float

return

2 8 int .

floatfloat int

.

void

.

8/14/2019 C++ Functions

8/21

( )

-:

:#include

int sum(){int x = 5 , y = 4;return x + y;}

void main(){int z = sum();

cout

8/14/2019 C++ Functions

9/21

( (

:-

:#include

void cube(int x){cout

8/14/2019 C++ Functions

10/21

:#include

void sum(){int x = 5 , y = 4;int z = x + y;cout

8/14/2019 C++ Functions

11/21

void main(){int x = 5;element(x);cout

8/14/2019 C++ Functions

12/21

int x = 5;x = element(x);cout

8/14/2019 C++ Functions

13/21

x = element(x,y);cout

8/14/2019 C++ Functions

14/21

x++;y--;cout

8/14/2019 C++ Functions

15/21

int x = 5 ,y = 4;cout

8/14/2019 C++ Functions

16/21

return x + y;}double sum(double x, int y){return x + y;}int sum(int x, int y , int z){return x + y + z;}

void main(){

cout

8/14/2019 C++ Functions

17/21

1- Definition2- Declaration

Definition :

Declaration : Header

8/14/2019 C++ Functions

18/21

.

Declaration error cube

Header

Header Header File

:cube(int);

; {} .

:

:#include

cube(int);

8/14/2019 C++ Functions

19/21

void main(){cube(2);}int cube(int x){return x*x*x;}

int float Reference void

:change(float ,int&);

main main main

:-

:#includecube(int);

void call(){

cube(2);}

8/14/2019 C++ Functions

20/21

void main(){call();}int cube(int x){return x*x*x;}

main callcall cube main

call cube Declaration cube Header.

(Function) main

main ( ) .

8/14/2019 C++ Functions

21/21

Functions

.()