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What is an extern storage class in C language?
There are four storage classes in C programming language, which are as follows −
- auto
- extern
- static
- register
Global variables / External variables
The keyword is extern. These variables are declared outside the block.
Scope − Scope of a global variable is available throughout the program.
Default value is zero.
Algorithm
The algorithm is given below −
START Step 1: Declare and initialized extern variable Step 2: Declare and initialized int variable a=3 Step 3: Print a Step 4: Call function step 5 Step 5: Called function Print a (takes the value of extern variable)
Example
Following is the C program for extern storage class −
extern int a =5; /* this ‘a’ is available entire program */ main ( ){ int a = 3; /* this ‘a' is valid only in main */ printf ("%d",a); fun ( ); } fun ( ){ printf ("%d", a); }
Output
The output is stated below −
3 1
Consider another program for extern storage class −
Example
External.h extern int a=14; extern int b=8; externstorage.c file #include<stdio.h> #include "External.h" int main(){ int sub = a-b; printf("%d -%d = %d ", a, b, sub); return 0; }
Output
The output is stated below −
a-b=6
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