C++ Functions and Variable Passing
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Questions and Answers

What are the values passed to a function during the function call called?

  • Identifiers
  • References
  • Arguments (correct)
  • Parameters

Which of the following accurately describes a variable in the context of functions?

  • A variable can only contain static values.
  • A variable has only a unique address.
  • A variable is the same as a function.
  • A variable has both a value and a unique address. (correct)

In which method does the original variable's value change when modifications are made inside the function?

  • Pass by Value
  • Pass by Copy
  • Pass by Shadowing
  • Pass by Reference (correct)

What is it called when you pass a variable's value to a function?

<p>Value passing (D)</p> Signup and view all the answers

Which of the following statements about function parameters is correct?

<p>Parameters are local variables specific to a function. (D)</p> Signup and view all the answers

What does the function call pow(a, b) demonstrate?

<p>Passing multiple variables (B)</p> Signup and view all the answers

What term refers to the actual parameters passed to a function during a call?

<p>Actual parameters (B)</p> Signup and view all the answers

Which of the following is NOT a valid passing method for function arguments?

<p>Pass by Swap (D)</p> Signup and view all the answers

What term describes a variable in a function header that holds the value passed as an argument?

<p>Formal parameter (C)</p> Signup and view all the answers

Which of the following correctly describes 'pass by value'?

<p>The value of the variable is passed to the function (D)</p> Signup and view all the answers

When a function is called with multiple arguments, what does the receiving function do?

<p>Creates copies of the actual variables (D)</p> Signup and view all the answers

What will be the output of the following code snippet? int a = 5; fun(a); cout << a;

<p>5 (A)</p> Signup and view all the answers

Which programming language feature is illustrated by 'pass by reference'?

<p>The variable's address is passed (B)</p> Signup and view all the answers

In the provided programming example, what is the correct declaration of the function?

<p>void fun(int x) (B)</p> Signup and view all the answers

In which scenario would 'pass by value' be the preferred method?

<p>When data integrity needs to be maintained (D)</p> Signup and view all the answers

What does the function prototype 'void fun(int x);' signify?

<p>x is a formal parameter (B)</p> Signup and view all the answers

Why is it important to understand the difference between pass by value and pass by reference?

<p>It influences system performance (A)</p> Signup and view all the answers

What characterizes a parameter during a function call?

<p>It is created only during the function execution (A)</p> Signup and view all the answers

Flashcards

Pass by Value

Passing a variable's value to a function. Changes to the copy inside the function don't affect the original variable.

Pass by Reference

Passing a variable's address to a function. Changes made to the variable inside the function directly affect the original variable.

Arguments

The values sent to a function when you call it.

Parameters

The variables declared inside a function that receive the arguments.

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Memory Location

Each variable in memory has a unique address called a memory location.

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Parameter Passing

Data gets passed from one part of the program to another (like a function).

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Parameter Passing Technique

A specific method of sending data to a function (either by value or by reference).

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Reference Variable

A variable that directly points to the memory location of another variable.

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String

A variable that holds a sequence of characters, like a word or a sentence.

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Void

A keyword that indicates the start of a function's definition in C++.

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Prototype Declaration

A function's signature in C++ that outlines the return type, the function name, and the parameters it accepts.

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Main Function

A special function in C++ that is the starting point for the program's execution. It's identified with the 'int main ()' declaration.

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Input

A reserved word that indicates that the function is designed to receive input and perform an associated action.

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cout

A keyword used for outputting information to the console screen in C++.

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Passing Multiple Arguments

The action of passing multiple arguments to a function, providing it with different values that it can use to execute its logic.

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Passing Variables By Value

A technique for passing variables to functions, where each variable is treated as an independent entity, and any changes made to the variable's copy within the function do not affect the original variable.

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Study Notes

Function Part 2: Passing Variables

  • Functions can receive data using "pass by value" or "pass by reference".
  • Pass by value creates a copy of the data, so changes inside the function do not affect the original data.
  • Pass by reference sends the address of the data, so changes inside the function directly affect the original data.

Passing Multiple Arguments

  • The number of arguments in a function call must match the function's definition.
  • Arguments are matched to parameters in the order they appear.
  • The first argument initializes the first parameter, and so on.

Passing Variables by Value

  • The computer makes a copy of each argument's value.
  • The receiving function cannot modify the original variable's value.
  • This approach is the default in C++.

Passing Variables by Reference

  • The address, or memory location, of a variable is passed.
  • Changes made to the parameter inside the function affect the original variable.
  • Use the '&' symbol (address-of operator) before the parameter name in the function declaration.

Using Reference Variables as Parameters

  • Reference variables act as aliases for another variable.
  • They allow functions to directly modify original values.
  • Functions can return multiple values this way.

Pass by Reference vs Value

  • Pass by value creates a copy, which protects the original data.
  • Pass by reference modifies the original data directly.
  • Choose based on whether you want to modify the original data.

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Function Part 2 PDF

Description

This quiz covers key concepts in C++ related to functions, specifically how variables can be passed by value or by reference. Understand the implications of each method and the correct usage of arguments when calling functions. Test your knowledge on matching parameters with arguments and the default behaviors in C++.

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