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Chapter 10: Problem 19

Give a definition for the function with the following function declaration. The class BankAccount is defined in Display 10.5 double difference(BankAccount account1, BankAccount account2); / / Precondition: account1 and account2 have been given values // (that is, their member variables have been given values). // Returns the balance in account1 minus the balance in account2.

Short Answer

Expert verified
Question: Define a function called 'difference' that takes two BankAccount objects as arguments and returns the difference in their balances. Answer: The 'difference' function can be defined as follows: ```cpp double difference(BankAccount account1, BankAccount account2) { double balance1 = account1.get_balance(); double balance2 = account2.get_balance(); double difference_value = balance1 - balance2; return difference_value; } ```

Step by step solution

01

Function Declaration

First, we need to write the function declaration, which is already provided. Copy the following function declaration to start our function definition: ``` double difference(BankAccount account1, BankAccount account2); ```
02

Accessing BankAccount Balances

Now, we want to access the balance of each BankAccount object. Let's assume there is a public member function in BankAccount class called 'get_balance()', which returns the balance of the account. We can access the balance of both accounts as follows: ``` double balance1 = account1.get_balance(); double balance2 = account2.get_balance(); ```
03

Calculate Difference

To calculate the difference between the two account balances, subtract balance2 from balance1: ``` double difference_value = balance1 - balance2; ```
04

Return the Result

Finally, return the calculated difference as the function output: ``` return difference_value; ```
05

Complete Function Definition

Now we can combine the steps to form the complete function definition: ```cpp double difference(BankAccount account1, BankAccount account2) { double balance1 = account1.get_balance(); double balance2 = account2.get_balance(); double difference_value = balance1 - balance2; return difference_value; } ```

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Most popular questions from this chapter

What is the relationship between cin and a variable of type ifstream?

Define a function called copy_char that takes one argument that is an input stream. When called, copy_char will read one character of input from the input stream given as its argument and will write that character to the screen. You should be able to call your function using either cin or an input-file stream as the argument to your function copy_char. (If the argument is an input-file stream, then the stream is connected to a file before the function is called, so copy_char will not open or close any files.) For example, the first of the following two calls to copy_char will copy a character from the file stuff. dat to the screen, and the second will copy a character from the keyboard to the screen: ifstream fin; fin.open("stuff.dat") copy_char(fin) copy_char(cin)

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Given the following struct definition: struct \(A\) \\{ int member \(_{-} b\) int member_c; \\}; declare \(x\) to have this structure type. Initialize the members of \(x\) member \(_{-} b\) and member_c, to the values 1 and 2 , respectively. Note: This requests an initialization, not an assignment of the members. This distinction is important and will be made in the text in a later chapter.
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