Answer Posted / sujitpatel

there are 4 types of classes
1 extern
2 static
3 register
4 auto
auto is default storage class which is used as for the
default value . if something s written int a ; then its
default storage is called auto . whereas the scope of the
stATIC and register is for only a file .there is only a
difference that register is used for cpu and static is used
for main memory . the scope of the extern is global it is
used for the whole program .

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