Answer / Pankaj Nsom

"Structures in C are user-defined data types that group multiple variables together, each of which may have a different type. A structure can be declared as: struct student { char name[30]; int roll_number; float marks; }; Unions in C allow a variable to occupy the memory space of another variable of a different type. Only one member of a union can store a value at any given time. They are useful when multiple data types need to be stored in the same memory location, but they share the same memory footprint."

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what does keyword ‘extern’ mean in a function declaration?

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