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Structures, Unions, Enums - Programming

Q1:

Point out the error in the program? 
struct emp
{
    int ecode;
    struct emp *e;
};

A Error: in structure declaration

B Linker Error

C No Error

D None of above

ANS:C - No Error

This type of declaration is called as self-referential structure. Here *e is pointer to a struct emp.