Below are PRIP 1.1 Sumita Arora Solutions for class 12 Computer Science. To view chapter 1 conceptual videos, visit here.
To view Sumita Arora solutions for all chapters, visit here.
Q1: For each of the following write single python statement:
a) Tell the user to enter your name, then read in, and assign to a variable, a string typed in by the user
Answer:
name = input("Enter your name : ")b) Tell the user to enter your age, then read in, and assign to a variable, a integer typed in by the user
Answer:
age = input("Enter your age : ")c) Print out, on separate lines, Your name is name and Your age is age, where name and age are the values of the two variables entered above
Answer:
print("your name is {}".format(name))
print("your age is {}".format(age))output:
your name is Computer tutor
your age is 20Q2: Given examples of legal variable names and two examples of illegal variable names in python. For the illegal variable names explain why they are illegal. Do not use one-letter variable name
#Legal Variables :
my_name = "Computer Tutor"
myname = "Computer Tutor"
_my_name = "Computer Tutor"
_myname = "Computer Tutor"
myName = "Computer Tutor"
MyName = "Computer Tutor"
MYName = "Computer Tutor"
myname1 = "Computer Tutor"
#Illegal variable :
2myname = "Computer Tutor"
my-name = "Computer Tutor"
my name = "Computer Tutor"
.myName = "Computer Tutor"Note:
In python variable name should be of alpha-numeric characters i.e.(A-Z , a-z & 0-9) and underscore ‘_’
Also variable name can not start with number i.e. 0-9
e.g. 2name is not allowed but,
name2 or na2me are allowed
Printing any variable with invalid syntax will raise error : “SyntaxError: invalid syntax”
Q.3: In each of the following parts there is an error in the python code. Identify the error by name and describe the problem.
(Each piece of code is prefixed with a brief description of the programmer’s intention. )
a) The following code attempts to compute the product of m and x added to b and assign that value to y. y = mx + b
Answer:
m, x, b = 3, 2, 1
y = mx + b
print(y)
Error after execution of above code is
NameError: name 'mx' is not defined
In python multiplication of two variables is calculated using * operator
in equation if we want to compute multiplication of m and x we should write m*x
so the correct statement would be
y = m * x + b
b) The following code attempts to compute the first-order effects of some physical process.
You may assume that equation is correct.
cofactor = alpha*x*x
1storder = 1.0/cofactor
2ndorder = 2.0**1storder
Answer:
x = 5
cofactor = alpha*x*x
1storder = 1.0/cofactor
2ndorder = 2.0**1storder
Error raised by above code is:
1storder = 1.0/cofactor
^
SyntaxError: invalid syntax
reason:
In python variable name should be of alpha-numeric characters i.e.(A-Z , a-z & 0-9) and underscore ‘_’
Also variable name can not start with number
i.e. 0-9
e.g. 2name is not allowed but,
name2 or na2me are allowed
Q.4: While taking input from input(),you need to convert the input into float and int types, if you are reading numbers
a) What built-in function do you use to convert a string into a floating-point number ? Demonstrate this function by converting string ’85’ into floating-point number and assigning it to a variable x.
Answer:
In python to convert string to floating-point number float() function is used
float function takes input of string/integer datatype and outputs floating-point value
code:
str = '85'
value = float(str)
print("Type of value variable : {}".format(type(value)))
output:
Type of value variable : <class 'float'>
b) What built-in function do you use to convert a string into an integer ?
Answer:
In python to convert string to integer number int() function is used
int function takes input of string/floating-point datatype and outputs integer value
code:
str = '85'
value = int(str)
print("Type of value variable : {}".format(type(value)))
output:
Type of value variable : <class 'int'>
c) What happens when you try to convert a string into an integer though the string is not a number?
Answer:
code:
str = 'ab'
value = int(str)
print(value)
print("Type of value variable : {}".format(type(value)))
output:
1 str = 'ab'
----> 2 value = int(str)
3 print(value)
4 print("Type of value variable : {}".format(type(value)))
ValueError: invalid literal for int() with base 10: 'ab'
when integer conversion of string though it is not a number
value error exception is raised
Reason with base 10 we have numbers in range 0-9
Q.5: What would be the output of following code?
print(‘doesn\’t’)
print(“doesn\’t”)
print(‘”Yes,”he said.’)
print(“\”Yes,\”he said.”)
Answer:
code:
print('doesn\'t')
print("doesn\'t")
print('"Yes,"he said.')
print("\"Yes,\"he said.")
output:
doesn't
doesn't
"Yes,"he said.
"Yes,"he said.
Q.6: Write a program to print the acrostic poem as shown below:
In the output, you need not to print bigger letters for P E A C E, but make sure these letters make a verticle word in output.
(Acrostic poems are literary composition in which certain letters in each line form a word vertically. This acrostic poem for Peace was made using Bible verse, John 16:33)
These things I have sPoken unto you,
that in me yE might have peace.
The world ye shAll have tribulation:
but be good for Cheer;
I have overcomE the world.
Answer:
print("These things I have sPoken unto you,")
print(" that in me yE might have peace.")
print(" The world ye shAll have tribulation:")
print(" but be good for Cheer;")
print(" I have overcomE the world.")Q.7: Write A program to print ASCII art using print statement
a)
Code:
print(" ______________ ________________")
print(" / \ / / \ \ ")
print(" / / \ \ \ | - - \ ")
print(" | | | / - \ | ")
print(" / / \ \ ")
print(" | __ \ \|| / / \_____________ \ \ ")
print(" | / | | \ | ")
print(" | | __ | | \ \ ")
print(" / | \ | | \ | ")
print(" | | \ | | ==== | | ")
print(" | | __ | | (o-) _ | | ")
print(" | __\ (_o) | / \ | | ")
print(" | | | Heh Heh Heh / ) ) | | ")
print(" \ || \ / Huh Huh Huh / ) / | | ")
print(" | |__ \ / \ |___ - | | ")
print(" | | (*___\ / \ *' | | ")
print(" | | _ | / \ |____ | | ")
print(" | | //_______| ####\ | | ")
print(" | / |_|_|_|___/\ ------ |_/ ")
print(" \| \ - | | | ")
print(" | _----_______/ \_____ | ")
print(" | / \ | ")
print(" | / \ | ")
output: ______________ ________________ / \ / / \ \ / / \ \ \ | - - \ | | | / - \ | / / \ \ | __ \ \|| / / \_____________ \ \ | / | | \ | | | __ | | \ \ / | \ | | \ | | | \ | | ==== | | | | __ | | (o-) _ | | | __\ (_o) | / \ | | | | | Heh Heh Heh / ) ) | | \ || \ / Huh Huh Huh / ) / | | | |__ \ / \ |___ - | | | | (*___\ / \ *' | | | | _ | / \ |____ | | | | //_______| ####\ | | | / |_|_|_|___/\ ------ |_/ \| \ - | | | | _----_______/ \_____ | | / \ | | / \ |
b)
code:
print(" .- - - - -. ")
print(" ( #-... ' ` \ ")
print(" \ # | ")
print(" _)\" ==== \"|_ ")
print(" (_`\"======\"`_) ")
print(" /`\"\"\"\"\"\"\"\"` \ ")
print(" | o _o\ ")
print(" | ( _> | ")
print(" \ ' .___/--# ")
print(" '. ;-._:'\ ")
print(" )===\ <>_/ __ ")
print(" .---\"\" `====` - ` \__. ' `| ")
print(" / ()\ / ")
print(" \___..--' \_.-' ")
print(" | ()| ")
print(" ; ; ")
print(" \ ()/ ")
print(" \ '. / ")
print(" _.' `\ '; ")
print(" ( `\ \_ ")
print(" \ .- `\ `\ ")
print(" \____) `._____ .' ")
output: .- - - - -. ( #-... ' ` \ \ # | _)" ==== "|_ (_`"======"`_) /`""""""""` \ | o _o\ | ( _> | \ ' .___/--# '. ;-._:'\ )===\ <>_/ __ .---"" `====` - ` \__. ' `| / ()\ / \___..--' \_.-' | ()| ; ; \ ()/ \ '. / _.' `\ '; ( `\ \_ \ .- `\ `\ \____) `._____ .'
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