Scope of variable

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Scope Of Variable

Overview

Variable

Scope Of Variable

Global Variable

Local Variable

Program

Variable

• Element of the Programing Language.

• Hold data temporary.

• Value Lost as soon as program terminate

• Declaration:

data type variable name;

Scope of Variables

• Scope refers to the visibility of variables.

• Two types

Local

Global

Global Variables

• Declared out side of all Function.

• Every part of program can access.

• Many functions use the same data.

Example

• Example: #include <stdio.h>

int count; /* count is global */

void func1(void);

void func2(void);

main(void)

{

count = 100;

func1();

}

void func1(void)

{

printf("count is %d", count);

}

void func2(void)

{ for(count=0; count<10; count++) printf("count is %d", count); }

Example contd..

Local Variables

• Declared inside a function or Block.

• Scope restricted.

• Scope begun by an opening brace and ends with its

closing brace.

Example

#include <stdio.h>

void func1(void);

void func2(void);

main()

{

int count; /* count is global */

count = 100;

func1();

}

Example cont.

void func1(void)

{

Int count;

printf("count is %d", count);

}

void func2(void)

{

for(count=0; count<10; count++) //error

printf("count is %d", count);

}

Example combination

int g = 20;

funcn()

{

Int g=30; //print 30

Printf(“%d”,g);

}

int main ()

{

Printf(“%d”,g); //print 20

}

Factorial Of a Number

#include<stdio.h>

int Factorial(int n)

{

int fact=1;

if(n==1)

return 1;

else

return fact=n*Factorial(n-1);

}

Factorial contd..

main()

{

int n,f;

printf("enter Number to find factorial: ");

scanf("%d",&n);

f=Factorial(n);

printf("factorial of %d: %d",n,f);

}

Return 3*2 i.e 6

• N=5

• 5*Factorial(4);

• 4*Factorial(3);

• 3*Factorial(2);

• 2*Factorial(1);

• Return 1

Return 4*6 i.e 24

Return 2*1 i.e 2

Return 5*24 i.e 120

Factorial of 5 :120

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In C++

Int main()

{

Private:

Protected:

Public:

}

In java

Int main()

{

Default:

Private:

Protected:

Public:

}