Quiz 5 - Functions And Pointers | Attempts: 218

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| By Aamirakbar

Aamirakbar

Community Contributor

Quizzes Created: 1 | Total Attempts: 218

Questions: 10 | Attempts: 218 | Updated: Mar 30, 2023

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Questions and Answers

1.

Pointer is a special kind of a variable which is used to store _______ of a variable
- A.
  
  Data Type
- B.
  
  Value
- C.
  
  Variable name
- D.
  
  Address
Correct Answer
D. Address

Explanation
A pointer is a special kind of variable that is used to store the address of another variable. By storing the address, the pointer allows us to indirectly access and manipulate the value of the variable it points to. This is useful in situations where we need to pass variables by reference or dynamically allocate memory. Therefore, the correct answer is "address".

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2.

The operator used to declare a pointer variable is
- A.
  
  ^
- B.
  
  %
- C.
  
  *
- D.
  
  &
Correct Answer
C. *

Explanation
The correct answer is * because in C and C++, the asterisk (*) symbol is used to declare a pointer variable. The asterisk is placed before the variable name to indicate that it is a pointer variable, which stores the memory address of another variable.

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3.

Variable passing by reference is achieved by using pointers.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Variable passing by reference is achieved by using pointers. In programming, passing by reference means that a reference to the original variable is passed to a function, allowing the function to directly modify the original variable. Pointers are used to achieve this behavior in many programming languages. By passing the memory address of a variable, the function can access and modify the original variable, rather than creating a copy. Therefore, the statement that variable passing by reference is achieved by using pointers is true.

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4.

Char data type uses _____ byte (s), int data type uses _____ byte (s) and float uses _____ byte (s)
- A.
  
  2, 4, 1
- B.
  
  4, 2, 1
- C.
  
  1, 2, 4
- D.
  
  4, 1, 2
Correct Answer
C. 1, 2, 4

Explanation
The correct answer is 1, 2, 4. The char data type uses 1 byte, the int data type uses 2 bytes, and the float data type uses 4 bytes.

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5.

Passing by value means an exact copy of the variable is created and the value is assigned to it.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Passing by value means that when a variable is passed as an argument to a function, a copy of the variable is created and the value of the original variable is assigned to it. This means that any changes made to the copy within the function will not affect the original variable. Therefore, the statement is true.

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6.

Choose the best answerPrior to using a pointer variable
- A.
  
  It should be declared
- B.
  
  It should be initialized
- C.
  
  It should be both declared and initialized
- D.
  
  None of the above
Correct Answer
C. It should be both declared and initialized

Explanation
Prior to using a pointer variable, it is necessary to both declare and initialize it. Declaring a pointer variable means specifying its data type and name, while initializing it means assigning it a memory address to point to. If a pointer is not declared, it cannot be used in the program. Similarly, if it is not initialized, it does not have a valid memory address to point to, leading to potential errors or undefined behavior when trying to access the memory it points to. Therefore, both declaring and initializing a pointer variable are important steps before using it.

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7.

What does the following mean?int *ptr, p;
- A.
  
  Ptr is a integer pointer, p is not
- B.
  
  Both ptr and p are integer pointers
- C.
  
  P may be a pointer but ptr is not
- D.
  
  Both ptr and p are not pointers
Correct Answer
A. Ptr is a integer pointer, p is not

Explanation
This statement declares two variables, ptr and p. The declaration "int *ptr" means that ptr is a pointer to an integer. On the other hand, the declaration "p" does not have any asterisk (*) before it, indicating that it is not a pointer. Therefore, the correct answer is that ptr is an integer pointer, while p is not a pointer.

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8.

A pointer is
- A.
  
  A keyword used to create variables
- B.
  
  A variable that stores address of an instruction
- C.
  
  A variable that stores address of other variable
- D.
  
  All of the above
Correct Answer
C. A variable that stores address of other variable

Explanation
A pointer is a variable that stores the address of another variable. Pointers are used to indirectly access and manipulate data stored in memory. By storing the address of a variable, pointers allow for efficient memory management and the ability to pass variables by reference. Therefore, the correct answer is "A variable that stores the address of other variable."

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9.

#include<stdio.h>void f(){ printf("hello");}void main(){ f();}the code above has an error.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The code provided does not have any errors. It includes the necessary header file, defines a function "f()" that prints "hello", and calls the function "f()" in the main function. Therefore, the correct answer is False.

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10.

Suppose a variable x has an address fff0. declaring a pointer and assigning address of x is as follow.int *p = &x;printf("address of x = %d", *p);the output will be [address of x = fff0] stored in pointer p?
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The output will not be "[address of x = fff0] stored in pointer p". The output will be the value stored at the address pointed to by pointer p, which is the value of variable x. In this case, it will be the address of x, not the value of x itself.

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Current Version
Mar 30, 2023

Quiz Edited by
ProProfs Editorial Team
Nov 19, 2014

Quiz Created by
Aamirakbar

Quiz 5 - Functions And Pointers

Pointer is a special kind of a variable which is used to store _______ of a variable

The operator used to declare a pointer variable is

Variable passing by reference is achieved by using pointers.

Char data type uses ___ byte (s), int data type uses _ byte (s) and float uses ___ byte (s)

Passing by value means an exact copy of the variable is created and the value is assigned to it.

Choose the best answerPrior to using a pointer variable

What does the following mean?int *ptr, p;

A pointer is

#include<stdio.h>void f(){ printf("hello");}void main(){ f();}the code above has an error.

Suppose a variable x has an address fff0. declaring a pointer and assigning address of x is as follow.int p = &x;printf("address of x = %d", p);the output will be [address of x = fff0] stored in pointer p?