A local static variable is a variable, whose lifetime doesn’t stop with a function call where it is declared. It extends until the lifetime of a complete program. All function calls share the same copy of local static variables.
These variables are used to count the number of times a function is called. The default value of static variable is 0. Whereas, normal local scope specifies that the variables defined within the block are visible only in that block and are invisible outside the block.
The global variables which are outside the block are visible up to the end of the program.
Example
Following is the C program for local variable −
#include<stdio.h>
main ( ){
int a=40 ,b=30,sum; //local variables life is within the block
printf ("sum=%d" ,a+b);
}Output
When the above program is executed, it produces the following output −
sum=70
Example
Following is the C program for global variable −
int c= 30; /* global area */
main ( ){
int a = 10; //local area
printf ("a=%d, c=%d", a,c);
fun ( );
}
fun ( ){
printf ("c=%d",c);
}Output
When the above program is executed, it produces the following output −
a =10, c = 30
Example
Following is the C program for the local static variable −
#include <stdio.h>
void fun(){
static int x; //default value of static variable is 0
printf("%d ", a);
a = a + 1;
}
int main(){
fun(); //local static variable whose lifetime doesn’t stop with a function
call, where it is declared.
fun();
return 0;
}Output
When the above program is executed, it produces the following output −
0 1