Question: 21. A union can contain a structure. a. True b. False 22. When a blank argument is received by a macro, the preprocessor can substitute

21. A union can contain a structure.

a. True

b. False

22. When a blank argument is received by a macro, the preprocessor can substitute a default value only if a default value has been previously defined.

a. True

b. False

23. The expansion operator (&) expands text macros.

a. True

b. False

24. A structure definition does not take up any memory.

a. True

b. False

25. The FOR directive repeats a statement block based on the value of a counter.

a. True

b. False

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