Python questions QUESTION 1 How many iterations does the fol

Python questions

QUESTION 1

How many iterations does the following loop execute? (n initially is a strictly positive integer number.)

while n > 0:
  n = n // 10

Impossible to tell.

No (zero)

This is an infinite loop.

Equal to the number of decimal digits in n

  

QUESTION 2

What does the following code fragment display? Assume N is a natural (positive integer) number.

s = 0
i = 1
while i < N:
  s += i
  i += 1
print(s)

The sum of the first N-1 natural numbers.

The product of the first N-1 natural numbers.

The value of N.

The sum of the first N natural numbers.

  

QUESTION 3

What does the following code fragment display? Assume N is a natural (positive integer) number.

s = 1
i = 0
while i < N:
  s *= 10
i += 1
print(s)

N! (N factorial)

10^N

10! (10 factorial)

QUESTION 4

What applications benefit from having an infinite loop? (Check all that applies.)

A program that reads all lines from a text file and displays them in the reverse order.

A Web server.

A program that

A Web browser

QUESTION 5

Which statements immediately terminate a loop within a function? (Check all that applies.)

pass

break

return

quit

  

QUESTION 6

Which value can be used as a sentinel to terminate a loop in which users are asked to enter floating point numbers?

Any integer number.

Any negative number.

\"quit\"

0

QUESTION 7

What is wrong with the following loop?

while busy:
  busy = check_if_busy()

The condition must be written as while busy==True:.

Functions cannot be used within a \"while\" loop.

The value of the

ariable

  

QUESTION 8

Experiment with the following function and find out what it calculates:

def foobar(x):
r, r1 = x / 2, x
while abs(r - r1) > 1e-10:
r, r1 = r1, (r + x / r) / 2
return r

The square root of x.

The absolute value of

The sine of x.

Nothing that I can think of.

QUESTION 9

The following code fragment was supposed to count all occurrences of square brackets in the string text. Why does not it work?

count = 0
i = 0
while i < len(text):
if text[i] == \"[\" or \"]\": count += 1
i += 1
print(count)

The body of the

The variable i must be initialized with

The closing brackets

The value of the variable i eventually becomes greater than the largest index in the string, and the selection operator [] crashes the program.

		Impossible to tell.
		No (zero)
		This is an infinite loop.
		Equal to the number of decimal digits in n

Solution

5.Which statements immediately terminate a loop within a function? (Check all that applies.)

Answer :-

break

quit

Explanation :-

* Break statement immediately terminate a loop within a function.

* quit statement immediately stops execution flow of a loop within a function.

7.What is wrong with the following loop?

while busy:
busy = check_if_busy()

Answer :-

* The condition must be written as while busy==True:.