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Storage Classes in Cfa

The document explains storage classes in C programming, which define the scope, default initial value, and lifetime of variables. It details four main types of storage classes: Automatic, Static, Register, and External, providing code examples and their outputs for each. Understanding these classes is essential for managing variable behavior during program execution.

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nischalbajgain922
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16 views5 pages

Storage Classes in Cfa

The document explains storage classes in C programming, which define the scope, default initial value, and lifetime of variables. It details four main types of storage classes: Automatic, Static, Register, and External, providing code examples and their outputs for each. Understanding these classes is essential for managing variable behavior during program execution.

Uploaded by

nischalbajgain922
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Storage classes are used to describe the features of a variable.

These
features basically include the scope, visibility and life-time which help
us to trace the existence of a particular variable during the runtime of
a program.

In C language, each variable has a storage class which decides the


following
things:
● scope i.e where the value of the variable would be available inside a
program.
● default initial value i.e if we do not explicitly initialize that variable,
what will be its default initial value.
● lifetime of that variable i.e for how long will that variable exist.
The following storage classes are most often used in C programming,
1. Automatic variables
2. External variables
3. Static variables
4. Register variables

Automatic variables: auto

Program:
#include <stdio.h>
int main( )
{
auto int j = 1;
{
auto int j= 2;
{
auto int j = 3;
printf ( "%d ", j);
}
printf ( "%d ",j);
}
printf( "%d", j);
}

Output :

3 2 1

Static variables: static

#include <stdio.h>
void display();
int main()
{
display();
display();
}
void display()
{
static int c = 1;
c += 5;
printf("%d ",c);
}

Output:
6 11

Register variables : register

#include <stdio.h>
int main( )
{
register int a=25;
printf("%d",a);
return 0;
}

Output:
25

External Variables : extern

File1.c
#include<stdio.h>
#include "file2.c"
extern int a;
int main()
{
printf("%d",a);
return 0;
}

File2.c
int a =50;

Output:
50

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