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Authors:
Barbara Dolye
Chapter:
Methods And Behaviors
Exercise:
Exercises
Question:15 | ISBN:9781285096261 | Edition: 4

Question

Given the following method definition, what would be a valid call? The variable
someIntValue is defined as an int.
public static int GetData(out int aValue, ref int bValue)
a. someIntValue = GetData(aValue, bValue);
b. someIntValue = GetData(out aValue, ref bValue);
c. someIntValue = GetData(out, ref);
d. someIntValue = GetData(int out aValue, int ref bValue);
e. GetData(out aValue, ref bValue);

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Answer

The correct answer is b. someIntValue = GetData(out aValue, ref bValue);

Explanation:

Consider the method definiton:

public static int GetData(out int aValue, ref int bValue)

  • This GetData method accepts the reference parameters.
  • It should contain the the keyword "out" and "ref".
  •  The first choice " someIntValue = GetData(aValue, bValue); " does not have the reference keyword "out" and "ref" parameters.  ITs only accept the interger variables. So, option (a) is NOT correct answer.
  • The second choice " someIntValue = GetData(out aValue, ref bValue); " is the valid call. It accepts reference parameters. So, the correct answer is (b).
  • The third choice " someIntValue = GetData(out, ref); " is missing the variables. Only reference keywords are provided. It is invalid call method. So, the option (c) is NOT correct answer.
  • The fourth choice " someIntValue = GetData(int out aValue, int ref bValue); "  is invalid statement.  So the option (d) is incorrect answer.
  • The final choice " GetData(out aValue, ref bValue); " is missig the storing variable " someIntValue ". So, the option (e) is incorrect.

So, the correct answer is b. someIntValue = GetData(out aValue, ref bValue);

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