Storage Class in C

C storage class is used to define the scope variables and function. There are four various types of storage classes that are given below.

1. auto:

The auto keyword is the default storage class for all the local variables. Let us consider an example.

{
int mount;
auto int month;
}

2. static:

In C language, static storage class is initialized only once time and use until when the program will be closed. It has default value 0.

#include <stdio.h>
void abc() {
int j=0;//local variable
static int i=0;//static variable++;
j++;
printf("i= %d and j= %d\n", i, j);
}
void main() 
{
abc();
abc();
}

3. extern

The extern variable is used to share two or more variables or function.

extern int counter=0;