BasicsWhat is storage class for variable A in below code?void main() { int A; A = 10; printf("%d", A);}Optionsautoexternregisterstatic

Break Down the Problem

1. Identify the context in which the variable A is declared.
2. Determine the default storage class for the variable based on its declaration and scope.

Relevant Concepts

1. Storage Classes in C: There are several storage classes in C:
   • auto: Default for local variables, storage is allocated when the block is entered and freed when it exits.
   • extern: Specifies that a variable is defined in another file or scope.
   • register: Indicates that the variable is to be stored in a register of the CPU for faster access.
   • static: Retains the value of the variable between function calls and restricts its scope to the file or function.

Analysis and Detail

1. In the provided code, A is declared within the main function. Since it is not prefixed by any storage class specifier, it defaults to auto.
2. The variable A has local scope, created when main starts and destroyed when main ends.

Verify and Summarize

Since there are no external qualifiers or attributes modifying A, it confirms the default storage class.

Final Answer

The storage class for variable A in the given code is auto.