Computer studies analysis of questions and answers

State two qualities of a good pseudocode.

15/1/2021

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State two qualities of a good pseudocode.

should be short and clean precise
should have start and end clearly shown.
Statements should be clearly defined.
should depict the logical flow of solving the problem.
should not be ambiguous.
it should be indented /neat / legibility

(b) With the aid of flowchart diagrams, describe each of the following programme control structures:
(i) sequence
(ii) selection

(i)Sequence

Program statements are executed one after the other in the order in which they appear.

(ii) Selection

(c) Draw a programme flowchart that would accept three numbers and find their sum. If the sum is greater than 200. It adds 30 to the sum, otherwise subtracts 20 from the sum. The programme should then display the results.

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Figure 1 shows a flowchart. Use it to answer the questions that follow.

13/1/2021

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Figure 1 shows a flowchart. Use it to answer the questions that follow.

(a) Interpret the flowchart.
(b) Write a pseudo code for the flowchart.

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List four web programming languages.

10/1/2021

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List four web programming languages.

HTML - Hyptertext Mark-up Language
Java script
VBScript - Visual Basic script
XML - Extensible Markup Language
PHP - Hypertext Preprocessor
SQL - Structured Query Language
Dream weaver
Front page

State four ways in which a programmer can make program code easy to fol1ow

Using modules or short blocks of program/functions/procedures;
Making internal documentation / comments;
Using meaningful variable names and user words in the program;
Using indent to represent nested statement:
Using blank lines to separate blocks of code statement;
Test formatting of reserved words e.g. bolding

Draw a program flowchart to represent the following pseudocode.

ANSWER

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State two advantages of using low level programming languages.

7/1/2021

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State two advantages of using low level programming languages.

(b) Other than flowcharts, state three tools that can be used to present an algorithm.
(c) A form one admission interview consists of four tests; Mathematics, English, Kiswahili and Science. In order to qualify for admission, an applicant must attain a minimum average of 65% in the four tests and not less than 70% in Mathematics. All applicants must sit for the interview. Draw a flowchart that would read the scores for each applicant and determine whether an applicant is successful or not.

(a) Advantages of using low-level language

program execution is immediate;
they require no compilation, no interpretation/translation hence they are faster;
hardware optimization is extensive;
program developed takes less memory space;
suitable for micro devices;
easy to design electronic device.

(b) Three tools that can be used to develop an algorithm

Decision table
pseudocode;
natural language;
top down charts;
flowcharts.
DFD/context diagram
ERD
decision tree

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Explain the term dry running as used in program development.

7/1/2021

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(a) Explain the term dry running as used in program development. (2 marks)

Dry running is the process where a progran2e manually works through a code to trace the values of variables and identify any error.

(b) Explain three properties of an algorithm. (6 marks)

Finiteness: An algorithm must always terminate after a finite number of times steps.
Definiteness: Each step must be precisely be defines using an action to be performed at each step of the algorithm.
Input: Any operation performed needs beginning value associated with different activities in the operation
Output: An algorithm must have a form of output/results/expected value/qualities.

(C) To qualify to get a driving license, an applicant must be 18 years or over. Ten candidates applied for the driving license test. Draw a flow chart that would read the name and age of an applicant and display the names of those who qualify. (7 marks)

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Figure 3 shows a flowchart. Use it to answer the questions that follow.

6/1/2021

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Figure 3 shows a flowchart. Use it to answer the questions that follow.

(i) Determine the output from the flowchart if:
I. X=5;
II. X=7.
(ii) Write a Pseudocode for the flowchart in figure 3.
(iii) Modify the flowchart so that it can be used to get the sum of integers between 50 and 100.
(b) List two programming language translators.

RESPONSES

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State the use of each of the following flowchart symbols.

5/1/2021

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State the use of each of the following flowchart symbols.

(b)Below is an algorithm that is used to compute the values of R, S and T.

From the algorithm, determine the output if the input value of N is:
(i) 7;
(ii) 10.
(c) Draw a flowchart for the algorithm in Question 16 (b).

RESPONSES

(a) (i) An entry from, or an exit to another part of the program flowchart that is within the same page.
It is an on page connector.
(ii) A connector used instead of the connector symbol to designate entry to or exit from a page.
It is an off page connector
(iii) The beginning and/or end in a program.
To start and/or stop/terminate in a program.

From the algorithm, determine the output if the input value of N is: (i) 7; (ii) 10. (c) Draw a flowchart for the algorithm in Question 16 (b).

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With the aid of a flow chart, describe a loop control structure as used in programming.

4/1/2021

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(a) With the aid of a flow chart, describe a loop control structure as used in programming. (4 marks)

Looping is the control structure that allows a block of code/statements to be repeated until a certain condition is fulfilled. (2 marks)

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Give two characteristics of scripting languages.

4/1/2021

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Give two characteristics of scripting languages.

(b) Describe two types of errors that may be detected during program testing.
(c) A company’s workers travel to work either by public or by private means. All workers are paid a travel allowance of Ksh. 200, but those using private means are paid an additional Ksh. 100.
(i) Write a pseudocode to determine a worker’s travel allowance.
(ii) Draw a flowchart to determine a worker’s travel allowance.
(iii) Other than occupying large space, state two disadvantages of using a flowchart instead of a pseudocode.

(a) Characteristic of scripting language:

Use of tags.
It is interpreted and not compiled.
Do not have declaration part.
User friendly
Are portable. .
Must be embedded in the browser.

(b) Syntax Errors: Errors arising due to violation of language rules.

Logical Errors: Errors arising from poor logic such as incorrect use of formulas/semantic.
Runtime Errors: Occur when there is abrupt interruption of running program.
When the running program stops abruptly.

(b) Describe two types of errors that may be detected during program testing. (c) A company’s workers travel to work either by public or by private means. All workers are paid a travel allowance of Ksh. 200, but those using private means are paid an additional Ksh. 100. (i) Write a pseudocode to determine a worker’s travel allowance. (ii) Draw a flowchart to determine a worker’s travel allowance. (iii) Other than occupying large space, state two disadvantages of using a flowchart instead of a pseudocode.

(iii) Flowcharts require templates/complex symbols/special software while pseudo code requires only a text editor.
Drawing flowcharts takes a lot of time.
Flowcharts occupy more space.
Flowcharts permit development of logic sequences which cannot be coded
using valid structured code.
Translation of flow charts into individual code is harder/difficulty.

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Machine language programs are more difficult to write than high-level language programs. State two reasons for this.

3/1/2021

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Machine language programs are more difficult to write than high-level language programs. State two reasons for this.

(b) In order to process examination results of students in a school, their names, index numbers and scores in 11 subjects are required. The average score for each student is then determined and a grade assigned. This process is repeated for all 40 students in a class,
Draw a flowchart to:
. Read a student’s name, index number and the scores in all the subjects.
. Determine the student’s average score.
‘ Assign a grade to the student depending on the average score as follows:

Score Grade
80 ≤ score A
60 ≤score<8O B
40 ≤ score<60 C
score < 40 F

• Display the student’s name, index number, average score and the grade.
• Repeat the above steps for all the students in the class.
(e) Below ¡s a list of program segments in different generations of programming languages.
Identify the language for each.

(a) Disadvantages of machine level language It is time consuming to develop

It’s easy to make mistakes because only 0’s and 1 ‘s are used.
Program written for one computer model may not run on another computer model.

(b)

Start/Stop.
Computing average.
Assigning the grades.
Statement in the decision box.
Printing.
Looping (initializing, testing).

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Study the flowchart below and answer the questions that follow

2/1/2021

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Study the flowchart below and answer the questions that follow

(a) What would the flowchart generate as output if the value of N at input was:
(i) 6?
(ii)1?
(b) Write a pseudocode that does the same thing as the flowchart above
(c) Modify the flowchart so as to reject an input below and to avoid the looping when the input is 0

RESPONSES

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State the stage of program development in which

2/1/2021

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(a) State the stage of program development in which:

(i) A flowchart would be drawn

Design

(ii)The programmer would check whether the program does as required

Testing

(iii) The user guide would be written

Documentation

(iv) The requirements specifications would be written

Analysis

(b) State the output of the following flowchart segment

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Name the control structure depicted by the flowchart below

2/1/2021

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(a) Name the control structure depicted by the flowchart below

If…then …Else

(b) Explain the following terms as used in program implementation (2mks)

Parallel; running
running in alongside with the information system it is intended to replace
Direct change over
starting full operation instantly in the whole organization (cut – over) & replacing the old system

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Bidii wholesalers have two categories of customers for order processing. Category ‘A’ obtains 10% discount on all orders upto Kshs 10,000 otherwise the discount is 20% on the entire order.

1/1/2021

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Bidii wholesalers have two categories of customers for order processing. Category ‘A’ obtains 10% discount on all orders upto Kshs 10,000 otherwise the discount is 20% on the entire order. Category ‘B’ obtains 30% discount on all orders if the debt repayments is ‘good’ otherwise the discount is 15%. Draw a flowchart for the order processing.

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Study the flow chart below and answer the questions that follow.

31/12/2020

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Study the flow chart below and answer the questions that follow.

If DATA is the following sorted list of 13 elements, such that N 13:(where N is the number of elements in the list),1 1, 22, 30, 33, 40, 44, 55, 60, 66, 77,
80, 88, 99.
(a) Determine the output from the flowchart if ITEM is:
(1) 40
(ii) 99
(iii) 120
(iv) 5
(b) Explain the purpose of this flowchart.
(c) Write a pseudocode for the above flowchart.

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ANALYSIS OF KCSE COMPUTER STUDIES TOPICAL QUESTIONS & REVISION KITS

State two qualities of a good pseudocode.

(b) With the aid of flowchart diagrams, describe each of the following programme control structures: (i) sequence (ii) selection

​(c) Draw a programme flowchart that would accept three numbers and find their sum. If the sum is greater than 200. It adds 30 to the sum, otherwise subtracts 20 from the sum. The programme should then display the results.

Figure 1 shows a flowchart. Use it to answer the questions that follow.

List four web programming languages.

State four ways in which a programmer can make program code easy to fol1ow

​Draw a program flowchart to represent the following pseudocode.

State two advantages of using low level programming languages.

​(a) Explain the term dry running as used in program development. (2 marks)

​(b) Explain three properties of an algorithm. (6 marks)

(C) ​To qualify to get a driving license, an applicant must be 18 years or over. Ten candidates applied for the driving license test. Draw a flow chart that would read the name and age of an applicant and display the names of those who qualify. (7 marks)

Figure 3 shows a flowchart. Use it to answer the questions that follow.

State the use of each of the following flowchart symbols.

RESPONSES

​(a) With the aid of a flow chart, describe a loop control structure as used in programming. (4 marks)

Give two characteristics of scripting languages.

Machine language programs are more difficult to write than high-level language programs. State two reasons for this.

Study the flowchart below and answer the questions that follow

​(a) State the stage of program development in which:

(b) State the output of the following flowchart segment

​(a) Name the control structure depicted by the flowchart below

​​(b) Explain the following terms as used in program implementation (2mks)

Study the flow chart below and answer the questions that follow.

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(b) With the aid of flowchart diagrams, describe each of the following programme control structures:
(i) sequence
(ii) selection

(c) Draw a programme flowchart that would accept three numbers and find their sum. If the sum is greater than 200. It adds 30 to the sum, otherwise subtracts 20 from the sum. The programme should then display the results.

Draw a program flowchart to represent the following pseudocode.

(a) Explain the term dry running as used in program development. (2 marks)

(b) Explain three properties of an algorithm. (6 marks)

(C) To qualify to get a driving license, an applicant must be 18 years or over. Ten candidates applied for the driving license test. Draw a flow chart that would read the name and age of an applicant and display the names of those who qualify. (7 marks)

(a) With the aid of a flow chart, describe a loop control structure as used in programming. (4 marks)

(a) State the stage of program development in which:

(a) Name the control structure depicted by the flowchart below

(b) Explain the following terms as used in program implementation (2mks)