Answer Posted / aravind

Extern is nothing but a memory storage type.If we declare extern before the function than the variable can be accessed by that function not only locally but externally too.
extern int a=4
Int fun (int x)
{
x=a;
print gives a=4

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1022

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#define PRINT(int) printf("int = %d ",int) main() {< BR> intx,y,z; x=03;y=02;z=01; PRINT(x^x); z<<=3;PRINT(x); y>>=3;PRINT(y); }

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