Answer Posted / shashi sourabh kant

There are four type of storage classes in C. These are used
to store variables. These are Extern, Static, Register and
Auto. Auto is the default class assigned to any variable.
eg. if we define int x=10; then it means auto int x=10
register and static differ in only one grounds that
register is there in the cpu and static in the main memory.
extern is global and can be accessed by any program and
anywhere.

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