Q: Question 7(b)Rewrite following code fragments using while loopsfor i in range(1, 16) : if i % 3 == 0 : print i

i = 1 while i < 16: if i % 3 == 0 : print (i) i += 1

Q: Question 8(i)Write a short program to print the following series :1 4 7 10 ........... 40.

Solutionfor i in range(1, 41, 3) : print(i, end = ' ')Output1 4 7 10 13 16 19 22 25 28 31 34 37 40

Question 1

Question 2Consider the following code fragment :n = 3
while n == 3
    print n
n = n - 1(a) What will be the output of above code?(b) What is the reason behind this output ?(c) What change/corrections will you make to above code to make it print some output ?

Accepted Answer

(a) The given code will generate a syntax error.(b) The syntax of while statement has a colon after the condition which is missing in the given code. Thus, a syntax error is generated.(c) The following changes must be made to the code to print some output:n = 3
while n == 3 :
    print (n)
    n = n - 1The code given above will generate the following output:3

Question 2

Question 7What is the output of following code ?while 3 >= 3 :
    print 33 is printed once3 is printed three times3 is printed infinitely until program is closedError in code

Accepted Answer

3 is printed infinitely until program is closedReason — Since the given condition (3 >= 3) will always remain true, the while loop will execute indefinitely and keep on printing 3 on the output screen till the program is closed.

Question 3

Question 1What are selection statements ? How are they useful ?

Accepted Answer

A statement that carries out a set of instructions depending upon a condition's result is known as a selection or conditional statement. Python provides selection statements in the form of if and if-else statements.These statements enable a program to carry out a set of instructions depending upon a condition's result. For example,num = 5
if num >= 0 :
    print "Positive"
else :
    print "Negative"

Question 4

Question 3Differentiate between if and if-else statements.

Accepted Answer

Difference between if and if-else statements in Python:S.No.ifif-else1.if statement allows us to execute a code block when the condition is True.if-else statement allows us to execute different code blocks based on whether the condition is True or False.2.if statement does nothing in case condition evaluates to False.if-else statement executes the statements indented below else when the condition is False.

Question 5

Question 4Differentiate between for and while statements.

Accepted Answer

Difference between for and while statements in Python:S.No.forwhile1.for loop is used when the number of iterations are known beforehand.while loop is used when the number of iterations are not fixed and depends on a specific condition.2.for loop is used for iterating over a sequence or a range.while loop is used for repeated execution based on a condition.3.Syntax:for in : statements_to_repeatSyntax:while : statements_to_repeat

Question 6

Question 5(a)Rewrite the following code fragments using for loopwhile num > 0 :
    print num % 10 
    num = num/10

Accepted Answer

l = [1]
for x in l:
    l.append(x + 1)
    if num <= 0:
        break
    print (num % 10)
    num = num/10

Question 7

Question 5(b)Rewrite the following code fragments using for loopi = 100
while (i > 0) :
    print i
    i -= 3

Accepted Answer

for i in range(100, 0, -3) :
    print (i)

Question 8

Question 7(a)Rewrite following code fragments using while loopsmin = 0 
max = num 
if num < 0 :
    min = num 
    max = 0 
# compute sum of integers from min to max 
for i in range(min, max + 1): 
    sum += i

Accepted Answer

min = 0
max = num
if num < 0 :
    min = num
    max = 0
# compute sum of integers from min to max 
i = min
while i <= max:
    sum += i
    i += 1

Question 9

Question 7(b)Rewrite following code fragments using while loopsfor i in range(1, 16) : 
    if i % 3 == 0 : 
        print i

Accepted Answer

i = 1
while i < 16:
    if i % 3 == 0 :
        print (i)
    i += 1

Question 10

Question 8(i)Write a short program to print the following series :1 4 7 10 ........... 40.

Accepted Answer

Solutionfor i in range(1, 41, 3) :
    print(i, end = ' ')Output1 4 7 10 13 16 19 22 25 28 31 34 37 40

Question 11

Question 8(ii)Write a short program to print the following series :1 -4 7 -10 .......... -40

Accepted Answer

Solutionx = 1
for i in range(1, 41, 3) :
    print(i * x, end = ' ')
    x *= -1Output1 -4 7 -10 13 -16 19 -22 25 -28 31 -34 37 -40

Question 12

Question 9(a)Predict the output of the following code fragments :count = 0 
while count < 10: 
    print "Hello" 
    count += 1

Accepted Answer

OutputHello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
ExplanationThe while loop executes 10 times so "Hello" is printed 10 times.

Question 13

Question 9(b)Predict the output of the following code fragments :x = 10 
y = 0 
while x > y: 
    print x, y 
    x = x — 1 
    y = y + 1

Accepted Answer

Output10 0
9 1
8 2
7 3
6 4
ExplanationxyOutputRemarks10010 01st Iteration9110 09 12nd Iteration8210 09 18 23rd Iteration7310 09 18 27 34th Iteration6410 09 18 27 36 45th Iteration

Question 14

Question 10What will be output of the following code if the user enters Principal amount as 20000 and Time as 10 years.#Considering Python 2.7 
P = input("Enter Principal amount:") 
T = input("Enter Time:") 
if T > 10: 
SI = P*T*10/100 
else: 
SI = P*T*15/100 
print("Simple Interest = ", SI)

Accepted Answer

OutputEnter Principal amount:20000
Enter Time:10
Simple Interest =  30000
ExplanationThis Python program calculates the Simple Interest (SI) based on the given Principal amount (P) and Time (T) values. For time value of more than 10 years, the program takes the rate of interest as 10% and for 10 years or less it takes the rate of interest as 15%.

Question 15

Question 11Write a Python script that asks the user to enter a length in centimetres. If the user enters a negative length, the program should tell the user that the entry is invalid. Otherwise, the program should convert the length to inches and print out the result. There are 2.54 centimetres in an inch.

Accepted Answer

Solutionlen = int(input("Enter length in cm: "))
if len < 0:
    print("Invalid input")
else:
    inch = len / 2.54
    print(len, "centimetres is equal to", inch, "inches")OutputEnter length in cm: 150
150 centimetres is equal to 59.05511811023622 inches

Question 16

Question 12Write a program that asks the user for two numbers and prints Close if the numbers are within .001 of each other and Not close otherwise.

Accepted Answer

OutputEnter first number: 10.12345
Enter second number: 10.12354
Close

Question 17

Question 13Write a short program to print first n odd numbers in descending order.

Accepted Answer

Solutionn = int(input("Enter n: "))
x = n * 2 - 1

for i in range(x, 0, -2) :
    print(i)OutputEnter n: 5
9
7
5
3
1

Python Conditionals and Loops

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