Friday, July 29, 2016

C Basics - Auto Storage Class in C

The auto storage class is the default storage class for all local variables.

   int mount;
   auto int month;

The example above defines two variables with in the same storage class. 'auto' can only be used within functions, i.e., local variables.

Keyword auto
Storage Memory (stack)
Default Initial Value An unpredictable value, which is often called a garbage value.
Scope Local to the block in which the variable is defined.
Life Till the control remains within the block in which the variable is defined.

int main()
    auto int i = 1 ;
  auto int i = 2 ;
   auto int i = 3 ;
    printf ( "\n%d ", i ) ;
  printf ( "%d ", i ) ;
 printf ( "%d", i ) ;
 return 0;

The output of the above program would be:

3 2 1

Related topics:
Overview of Storage Class in C   |   Register Storage Class in C   |   Static Storage Class in C   |   Extern Storage Class in C   |   Summary of Storage Class in C

List of topics: C Programming

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