Interview Questions on Structures in C

A set of interview questions on structures in C.

1. What is a structure?
2. What are the differences between structures and unions?
3. What are the advantages of using unions?
4. How can you use typedef to define a type of structure?
5. Write a C program that returns 3 numbers from a function using a structure.
6. In below code snippet:
   

   struct Date {
    int yr;
    int day;
    int month;
   } date1,date2;
   date1.yr = 2004;
   date1.day = 4;
   date1.month = 12;
   

   Write a function in C that assign values to date2. Arguments to the function must be pointers to the structure Date and integer variables date, month, year.
   

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