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9.	What is the difference between structure and union?
	Union allocates the memory equal to the maximum memory required by the member of the union but structure allocates the memory equal to the total memory required by the members. In union, one block is used by all the member of the union but in case of structure, each member has their own memory space. Union is best in the environment where memory is less as it shares the memory allocated. But structure cannot implement in shared memory. As memory is shared, ambiguity is more in union, but less in structure. Self referential union cannot be implemented in any data structure, but self referential structure can be implemented.
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10.	What is variable in C?
	Program can manipulate the data. This location is used to hold the value of the variables. C variable might be belonging to any of the data type like int, float and char etc. The value of the C variable may get change in the program.
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11.	What is the default statement used in switch case in C?
	Switch case statements are used to execute only specifies case statements based on the switch expression. If switch expression does not match with any case, default statements are executed by the program.
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12.	What is the restriction on the declarations and/or definitions of variables?
	The restriction on the declarations and/or definitions is that they must come before the executable statements in a block, and hence they appear in the beginning of a block.
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