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Chapter 6: Problem 21

Reference variables allow arguments to be passed by __________

Short Answer

Expert verified
Answer: Reference variables allow arguments to be passed by reference, enabling the function or method to modify the original variable's value directly instead of working with a copy. This provides efficient and easy management of data and reduces memory usage. By using reference variables, changes made inside the function or method will directly affect the original variable.

Step by step solution

01

Definition

A reference variable allows arguments to be passed by reference, which means that the function or method can modify the original variable's value directly, instead of working with a copy of the variable's value.
02

Why Reference Variables are Useful

By passing arguments using reference variables, changes made inside the function or method will directly affect the original variable, allowing for efficient and easy management of data. It also reduces memory usage by not creating a copy of the variable's value.
03

Example

Let's go through a simple example to demonstrate the use of reference variables when passing arguments. Consider we have a function to increment a number by one: ```cpp #include using namespace std; void incrementByOne(int &number) { number = number + 1; } int main() { int value = 5; cout << "Value before increment: " << value << endl; incrementByOne(value); cout << "Value after increment: " << value << endl; } ``` In this example, the `incrementByOne()` function takes an integer reference variable `number` as its argument. When passing `value` to the function, the function directly increments `value` by one, without creating a copy of `value`. The output is: ``` Value before increment: 5 Value after increment: 6 ``` As you can see, by using reference variables, we have directly modified the original variable's value within the function.

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Most popular questions from this chapter

Write a function named biggest that receives three integer arguments and returns the largest of the three values.

Each of the following functions has errors. Locate as many errors as you can. A) void total (int valuel, value2, value3) \\{ return valuel \(+\) value \(2+\) value 3 3 B) double average (int value1, int value2, int value3) \\{ double average; average \(=\) valuel \(+\) value \(2+\) value 3 / 3 \\} C) void area (int length \(=30\), int width) \\{ return length \(\star\) width \\} D) void getvalue (int values) \\{ cout \(<<\) "Enter a value: " cin \(>>\) values \\} E) // Overloaded functions int getValue() \\{ int inputvalue; cout \(<<\) "Enter an integer: "; cin \(>>\) inputvalue return inputvalue; \\} double getvalue() \\{ double inputvalue; cout \(<<\) "Enter a floating-point number: " cin \(>>\) inputvalue; return inputvalue; \\}

If a function doesn’t return a value, the word _________ will appear as its return type.

Write a function named get Number, which uses a reference parameter to accept an integer argument. The function should prompt the user to enter a number in the range of 1 through \(100 .\) The input should be validated and stored in the parameter variable.

Values that are sent into a function are called _________.
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