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Chapter 3: Problem 6

Given the following statement, what would be the best heading for the DetermineAnswer( ) method? int茠aValue, 茠茠茠茠茠result; result茠=茠DetermineAnswer(27.83,茠aValue); a. public void DetermineAnswer(27.83, aValue) b. public int DetermineAnswer( ) c. public int DetermineAnswer(double v1, int v2) d. public double int DetermineAnswer( ) e. public void DetermineAnswer(double v1, int v2)

Short Answer

Expert verified
Option c: `public int DetermineAnswer(double v1, int v2)`.

Step by step solution

01

Analyze the Method Signature

In the assignment statement `result = DetermineAnswer(27.83, aValue);`, the method `DetermineAnswer` is called with two parameters: `27.83` (a double) and `aValue` (an int). This indicates that the method takes two arguments, one of type double and the other of type int.
02

Determine Return Type

The variable `result` is assigned the return value of the method `DetermineAnswer`. As `result` is declared as an integer, the method must return an integer (`int`). Thus, the return type of the method should be `int`.
03

Match With Provided Options

Now, we match the requirements derived from Steps 1 and 2 with the provided options: - Option a: Incorrect return type (`void`). - Option b: No parameters specified. - Option c: Matches - Correct return type `int` and correct parameters (`double, int`). - Option d: Incorrect return type format. - Option e: Incorrect return type (`void`).
04

Conclusion

Based on the parameter and return type analysis, the correct definition that fits the method signature is Option c `public int DetermineAnswer(double v1, int v2)`.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Method Parameters
In C#, a method parameter is crucial for passing information into a method. Parameters define what type of data will be accepted by the method, providing flexibility and specificity to a program.

Method parameters act like placeholders in a method signature. They let the method receive various data types which can be processed during execution.
  • Order and Types: The types and order of parameters in a method signature matter. When you call the method, the arguments you pass must match these precisely in both sequence and type.
  • Named Parameters: Parameters have names, allowing you to reference them inside the method easily for processing.
In our specific example where `DetermineAnswer` is called with `27.83` and `aValue`, the method requires a `double` followed by an `int` as parameters. The method signature will look like `DetermineAnswer(double v1, int v2)` ensuring it will appropriately handle different numeric types.
Return Type
The return type of a method in C# signifies what type of value the method will send back to the point where it was called. This is like answering a question with the appropriately typed answer.
  • Void Return Type: If no data is returned from the method, `void` is used as the return type.
  • Specific Type: If data needs to be returned, the specific type such as `int`, `double`, `string`, etc., replaces `void`.
In the context of our exercise, the method `DetermineAnswer` assigns a value to the variable `result` which is declared as an `int`. Therefore, the method must return an `int`, implying its return type cannot be void or any other type besides `int`. The method signature, therefore, correctly uses `public int` as its return type.
Method Analysis
Method analysis involves examining what a method does, what it needs, and what it returns. This helps developers understand how a method contributes to the overall functionality of the code.

When analyzing a method, consider these factors:
  • Purpose: What is the method meant to accomplish?
  • Inputs and Outputs: What parameters does it take, and what does it return?
  • Edge Cases: Are there any unusual inputs that could cause unexpected behavior?
Through method analysis, as demonstrated in this exercise, we determine that `DetermineAnswer` handles two types of parameters, processes them, and yields an integer outcome. This kind of analysis provides clarity and is crucial for troubleshooting and refining methods within larger codebases.
Programming Problem Solving
Programming problem solving often involves a systematic approach, combining logical reasoning with technical knowledge to tackle coding challenges.

Here are some key steps often involved:
  • Identify Requirements: Recognize what the program needs and specify the desired outcome.
  • Break Down the Problem: Divide complex problems into smaller, more manageable pieces.
  • Explore Solutions: Consider different approaches, examining both theoretical options and practical implementations.
  • Test Solutions: Verify solutions through tests and adjust the code as necessary.
In the case of determining the correct method signature for `DetermineAnswer`, problem-solving involves understanding both what is being asked and applying knowledge of method signatures, parameters, and return types to select the correct option. This structured problem-solving approach is a critical skill for developers to cultivate in order to effectively create and maintain software solutions.

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Most popular questions from this chapter

If a method is to be used to enter two values that will be used later in the program, which of the following would be the most appropriate heading and call? a. heading: public void InputValues(out int val1, out int val2) call: InputValues(out val1, out val2); b. heading: public void InputValues(int val1, int val2) call: InputValues(val1, val2); c. heading: public void InputValues(ref int val1, ref int val2) call: InputValues(ref val1, ref val2); d. heading: public int int InputValues( ) call: val1 = InputValues( ); val2茠=茠InputValues(茠); e. none of the above

Given the call to the method ComputeCost( ) shown below, which of the following would be the most appropriate heading for the method? The variable someValue is declared as an int. someValue = ComputeCost(27.3); a. public static void ComputeCost(double aValue) b. public static int ComputeCost( ) c. public static double ComputeCost(int someValue) d. public static int ComputeCost(double aValue) e. public static int ComputeCost(int aValue)

Write methods to do the following: a. Display three full lines of asterisks on the screen. b. Accept as an argument your age, and display that value along with an appropriate label. c. Accept two floating-point values as arguments. Display the values formatted with three digits to the right of the decimal. d. Accept three int arguments and return their sum. e. Accept no arguments and return no values. Initialize a local Boolean variable to true. Have the method print the Boolean鈥檚 value

Given the following task, which would be the most appropriate method heading? A method displays three integer values formatted with currency. a. public static int int int DisplayValues( ) b. public static int DisplayValues(int v1, int v2, int v3) c. public static void DisplayValues( ) d. public static void DisplayValues(int v1:C, int v2:C, int v3:C) e. public static void DisplayValues(int v1, int v2, int v3)

Given the following task,which would be the most appropriate method heading? Results have been calculated for taxAmount and totalSales.Write a method heading that accepts these values as input for display purposes. a. public static DisplayResults( ) b. public DisplayResults(double) c. public static void DisplayResults( ) d. public static void DisplayResults(double taxAmount, double totalSales) e. public static void DisplayResults(taxAmount, totalSales)
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