# ICSE Computer Science Practical Paper 2021 of Class 12 PDF Download

COMPUTER SCIENCE
Paper – 2
(PRACTICAL)
(Reading Time: 15 minutes)
(Planning Session AND Examination Session: Three Hours)
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The total time to be spent on the Planning and the Examination Session is Three hours.
After completing the Planning Session, the candidate may begin with the Examination
Session.
A maximum of 90 minutes is permitted to begin the Examination Session.
(Maximum Marks: 80)
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As it is a practical examination the candidate is expected to do the following:
1. Write an algorithm for the selected problem. Algorithm should be expressed clearly using ay standard
scheme such as pseudo code or in steps which are simple enough to be obviously computable. [10]
2. Write a program in JAVA language. The program should follow the algorithm and should be logically
and syntactically correct. [20]
3. Document the program using mnemonic names / comments, identifying and clearly describing the
choice of data types and meaning of variables. [20]
4. Code / Type the program on the computer and get a printout (hard copy). Typically this should be a
program that compiles and runs correctly. [10]
5. Test run the program on the computer using the given sample data and get a printout of the output in
the format specified in the problem. [20]
6. Viva-Voce on the Selected Problem. [20]
Solve any one of the following Problems:
Question 1.
An ISBN (International Standard Book Number) is a ten digit code which uniquely identifies a book.
The first nine digits represent the group, publisher and title of the book and the last digit is used to
check whether ISBN is correct or not.
Each of the first nine digits of the code can take a value between 0 to 9. Sometimes it is necessary to
make the last digit equal to ten. This is done by writing the last digit of the code as X.
To verify an ISBN, calculate 10 times the first digit, plus 9 times the second digit, plus 8 times the
third digit and so on until we add 1 time the last digit. If the final number leaves no remainder while
divided by 11, the code is a valid ISBN
For example:
0201103311=10*0+9*2+8*0+7*1+6*1+5*0+4*3+3*3+2*1+1*1=55
This is a valid ISBN
007462542X=10*0+9*0+8*7+7*4+6*6+5*2+4*5+3*4+2*2+1*10=176
This is a valid ISBN
Similarly 0112112425 is not a valid ISBN.
Test Data:
Input code: 0201530821
Output: Sum=99
Leaves no remainder – valid ISBN
Input code: 356680324
Output: Sum=invalid input
Input code: 0231428031
Output: Sum=122
Leaves remainder – invalid ISBN
Question 2:

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