Input and Output in Programming Principles: Master Input and Output Techniques

Question 1

In Python, how do you request user input and assign it to a variable called 'username'?

Accepted Answer

username = input('Enter your username: ')

Answer

input = username('Enter your username: ')

Answer

print('Enter your username: '), username = input()

Answer

username = 'Enter your username: '

Question 2

Why is it important to format output clearly and systematically?

Accepted Answer

To make the program easier to read and understand.

Answer

To save memory space.

Answer

To prevent errors from occurring during execution.

Answer

To make the program run faster.

Question 3

What is a potential consequence of neglecting input validation in software development?

Accepted Answer

Increased risk of software crashes

Answer

Reliable data processing

Answer

Simplified debugging process

Question 4

What is the primary purpose of the 'print()' function in Python?

Accepted Answer

To display information on the screen

Answer

To obtain user input

Answer

To store data in a variable

Answer

To perform mathematical calculations

Question 5

Which of the following is a valid syntax for reading user input in Python?

Accepted Answer

input()

Answer

read()

Answer

scanf()

Answer

cin

Question 6

What is the main purpose of using the 'while' loop in Python?

Accepted Answer

To execute a block of code repeatedly until a condition becomes false

Answer

To terminate the program prematurely

Answer

To store data in a variable

Answer

To perform mathematical operations

Question 7

Which Python data type is primarily used to represent text?

Accepted Answer

String (str)

Answer

Integer (int)

Answer

Floating-point number (float)

Answer

Boolean (bool)

Question 8

What is the primary purpose of the 'if-else' statement in Python?

Accepted Answer

To execute different blocks of code based on the evaluation of a condition

Answer

To obtain user input

Answer

To store data in a variable

Answer

To perform mathematical operations

Question 9

Which of the following is a valid variable name in Python?

Accepted Answer

my_name

Answer

1number

Answer

class

Answer

True

Question 10

Which of the following operators is used for string concatenation in Python?

Accepted Answer

+

Answer

*

Answer

/

Answer

%

Question 11

What is the primary function of the 'for' loop in Python?

Accepted Answer

To execute a block of code repeatedly for each element in a sequence

Answer

To terminate the program prematurely

Answer

To store data in a variable

Answer

To perform mathematical operations

Question 12

Which of the following is a method to read input from the user in Python?

Accepted Answer

input()

Answer

read()

Answer

getInput()

Answer

console.input()

Question 13

What is the primary purpose of the `print()` statement in Python code?

Accepted Answer

To display output on the screen or in the console

Answer

To read input from the user

Answer

To store data in a variable

Answer

To perform calculations and operations

Question 14

In Python 2, what is the key difference between `input()` and `raw_input()` functions?

Accepted Answer

`input()` evaluates the input as Python code, while `raw_input()` treats it as a string

Answer

There is no difference; they both perform the same action

Answer

`raw_input()` evaluates the input as Python code, while `input()` treats it as a string

Answer

Both `input()` and `raw_input()` treat the input as a string

Question 15

What is the correct Python syntax to convert user input to an integer?

Accepted Answer

int(input())

Answer

float(input())

Answer

input().toInt()

Answer

Integer.parseInt(input())

Question 16

Which of the following demonstrates the correct syntax for `f-string` in Python?

Accepted Answer

print(f'Hello, {name}')

Answer

print('Hello, {name}')

Answer

print(fHello, {name})

Answer

print('Hello, {{name}}')

Question 17

What is the fundamental difference between `stdout` and `stderr` in Python?

Accepted Answer

Both are used for output; however, `stderr` is specifically for error messages

Answer

Both are used for input; however, `stdin` is for standard input

Answer

Both are used for output; however, `stdin` is for error messages

Answer

Both are used for input; however, `stderr` is for standard input

Question 18

In Python, which method is used to redirect output to a specified file?

Accepted Answer

open('file.txt', 'w') as f: print('Hello', file=f)

Answer

open('file.txt', 'w').print('Hello')

Answer

print('Hello').toFile('file.txt')

Answer

write('Hello') to 'file.txt'

Question 19

What is the primary purpose of utilizing the `sys.exit()` function in Python?

Accepted Answer

To halt and terminate the execution of the program

Answer

To pause or suspend the execution of the program

Answer

To restart the execution of the program

Answer

To display an error message and continue execution

Question 20

Which format specifier is used to display a floating-point number with two decimal places?

Accepted Answer

%.2f

Answer

%f

Answer

%c

Answer

%s

Question 21

For a file opened in read mode, which of the following file access permissions is granted?

Accepted Answer

fopen("file.txt", "r")

Answer

fopen("file.txt", "w")

Answer

fopen("file.txt", "a")

Answer

fopen("file.txt", "w+")

Question 22

Which of the following is a valid file access mode for both reading and writing?

Accepted Answer

r+

Answer

r

Answer

a

Answer

w

Question 23

What is the primary purpose of using the fflush() function in C?

Accepted Answer

To force writing of buffered data to a file

Answer

To read data from a file

Answer

To open a file

Answer

To close a file

Question 24

Which of the following variable declarations in C is syntactically correct?

Accepted Answer

int num = 10;

Answer

int 10 num;

Answer

num int = 10;

Answer

10 int num;