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Chapter 7: Problem 20

A correct method call to a method that has the following heading would be: int result(intl ] anArray, int num) a. Console.Write (result(anArray, 3)); b. result (anArray, 30) c. Console.Write (result(anArray[ ], 3)); d. result (anArray[ ], 30) e. none of the above

Short Answer

Expert verified
Options a and b are correct.

Step by step solution

01

Analyze Method Signature

The method signature is provided as `int result(int[] anArray, int num)`. This indicates that the method takes two parameters: the first is an integer array, and the second is an integer number.
02

Evaluate Option a

Option a is `Console.Write(result(anArray, 3));`. It correctly passes `anArray` (assuming it's an integer array) and `3` (an integer) to the method `result`. It matches the method signature requirements.
03

Evaluate Option b

Option b is `result(anArray, 30)`. This option also correctly passes `anArray` and `30` as parameters to the `result` method. It is a valid method call.
04

Evaluate Option c

Option c is `Console.Write(result(anArray[], 3));`. However, the method signature requires `anArray` to be passed as an array, not with the brackets `[]`, which are used to declare an array or define array types in parameter lists.
05

Evaluate Option d

Option d is `result(anArray[], 30)`. Similar to option c, this syntax is incorrect because `anArray[]` suggests a mishandling of array description, which is not needed when passing an array to a method.
06

Determine the Correct Option

Option e states 'none of the above', but based on our analysis, options a and b are correct calls to the method. Therefore, option e is incorrect.

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Key Concepts

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

Method Signature
In C#, a **method signature** is critical as it defines a method's name along with its parameters. This allows you to identify the method uniquely within a class. If two methods have the same name but different parameter lists, their signatures differ.
A method signature includes:
  • The method's name
  • The number of parameters
  • The types of those parameters
These elements ensure that when the method is called, it will match the specific version you intended. In our exercise, the method signature was `int result(int[] anArray, int num)`, which specifies two parameters: an integer array and an integer number.
Parameters
**Parameters** are variables specified in a method's definition, which allow you to pass data into methods. They act like placeholders that will receive the actual values when the method is invoked. There are usually two types of parameters:
  • **Formal Parameters**: These are the variables declared in the method definition.
  • **Actual Parameters**: These are the real values or references during the method call.
In the exercise, `int[] anArray` and `int num` are formal parameters, while values such as `anArray` and `3` during the call are actual parameters. Correctly matching the types and number of parameters with the method signature is vital to ensure a valid method call.
Array
An **array** is a collection of items stored at contiguous memory locations. In C#, arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value.
Arrays are zero-indexed, meaning the first element has an index of 0. Arrays can be passed to methods in C#, which allows for processing or manipulation of the array's contents within the method.
  • Declaration example: `int[] numbers;`
  • Passing array to a method: `result(anArray, 3)`
It's crucial to respect the type specified in the method signature. The name of the array is enough when passing as an argument; the brackets `[]` are not needed, as they are part of declaring an array, not using one.
Method Call Validation
**Method call validation** ensures that the call to a method fits the method's signature and therefore works without producing compile errors. It involves checking both the number and types of arguments passed in a call against the method signature.
For successful validation:
  • The number of arguments supplied in the call should match the number of parameters in the method signature.
  • The types of these arguments must be compatible with the types expected by the method's formal parameters.
This validation is imperative for a program to compile and execute correctly. In our exercise, options like `result(anArray[], 3)` failed validation because the presence of brackets suggested syntax issues not matched by the method鈥檚 signature. Ensure that your method calls align precisely with the defined signature, as done in options a and b, for error-free execution.

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