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UNIT 1: PROBLEM SOLVING
1UNDERSTANDING ALGORITHMS
ACTIVITY 1
There is no single correct solution to this activity, since every student"s walk to school will be unique. It is intended to highlight
the need for instructions to be specic, precise and in a logical order. Encourage them to identify instances of repetition and
selection, e.g. Keep walking until you get to the end of the street. Next cross the road, providing no cars are coming."
Encourage students to use all the symbols shown in Figure 1.2 in their owchart.This owchart incorporates selection and
iteration. Students may simply identify a sequence of processes in their solution. ?fifl fifl? fifl? fl ?flStudents must be familiar with Pearson Edexcel pseudocode, which will be used to frame some of the exam questions
on Paper 2, but they don"t have to use it themselves. Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 116/05/20 3:39 PM
ACTIVITY 5
SEND Enter rst number." TO DISPLAY
RECEIVE rstNumb FROM KEYBOARD
SEND Enter second number." TO DISPLAY
RECEIVE secondNumb FROM KEYBOARD
SET thirdNumb TO rstNumb * secondNumb
SEND thirdNumb TO DISPLAY
Ask the user to enter their username.
Repeat until an existing username is entered.
Next ask the user to enter their password.
Repeat until the correct password is entered.
fi fi flfl?fl fl?? flfl?fl ??flfl? fl flflfl? fi?? fl fl fiS1 The speci?cs of this algorithm should refiect the procedure for borrowing books at the student's own local library or
school library. S2 Table 1.1 describes the function of each of the arithmetic operators. S3 and S4 Variables and constants are explained on page 9. C1 Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 216/05/20 3:39 PM C2SEND 'Enter ?rst number.' TO DISPLAY
RECEIVE ?rstNumb FROM KEYBOARD
SEND 'Enter second number.' TO DISPLAY
RECEIVE secondNumb FROM KEYBOARD
SEND 'Enter third number.' TO DISPLAY
RECEIVE thirdNumb FROM KEYBOARD
SET average TO (?rstNumb + secondNumb + thirdNumb)/3SEND average TO DISPLAY
Sendeni
g cciompou tceripeRvvisevni1R21Rn2RR3i4i
3i4 fi fl fifl fifl??fl?fl
?fl fifl??fl? flflSET mystNumb TO 3
SEND 'Please enter a number between 1 and 10.' TO DISPLAYRECEIVE guess FROM KEYBOARD
IF guess > 10 THEN
SEND 'Too high! Your guess must be between 1 and 10.' TO DISPLAY Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 316/05/20 3:39 PM ELSEIF guess = mystNumb THEN
SEND Well done! You have guessed correctly." TO DISPLAY ELSE SEND Bad luck! The correct number is" & mystNumb TO DISPLAYEND IF
END IF
SCOREOUTPUT
91A56D
78B
The activities in this chapter provide plenty of examples that students can use to illustrate their answer.
SEND Enter your height (in metres)." TO DISPLAYRECEIVE height FROM KEYBOARD
SEND Enter your weight (in kilograms)." TO DISPLAYRECEIVE weight FROM KEYBOARD
SEND Your body mass index (BMI) is:" & weight/height^2 TO DISPL AY (Reminder: height^2 means 'height to the power of 2', i.e. height 2 . See 'Arithmetic operators' on page 9 of the StudentBook.)
Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 416/05/20 3:39 PM 3SORTING AND SEARCHING ALGORITHMS
ACTIVITY 9
The variable
length is used to store the length of the list. The variable switch is initially set to 0.Starting at the beginning of the list, successive pairs of items are compared and swapped round if the rst item is bigger
than the second item. When a swap occurs the value of switch changes from 0 to 1. This process is repeated until the end of the list is reached. fifl fifl fifl fifl fiflfifl flC2 Encourage students to devise appropriate test data to check that the algorithm produces the right outcomes.
Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 516/05/20 3:39 PM If at the end of a pass through the list the value of switch hasn"t changed from 0 to 1, this indicates that no swaps have taken place, meaning that the list is now sorted. The algorithm then terminates. 4820 9 17 13 21 28 60
4820 9 17 13 21
28
60
48
20 9 17 13 21
28
60
48
20 9 17 13 21
28
60
48
20 17 9 21
13 60
28
48
UNIT 1: PROBLEM SOLVING
1UNDERSTANDING ALGORITHMS
ACTIVITY 1
There is no single correct solution to this activity, since every student"s walk to school will be unique. It is intended to highlight
the need for instructions to be specic, precise and in a logical order. Encourage them to identify instances of repetition and
selection, e.g. Keep walking until you get to the end of the street. Next cross the road, providing no cars are coming."
Encourage students to use all the symbols shown in Figure 1.2 in their owchart.This owchart incorporates selection and
iteration. Students may simply identify a sequence of processes in their solution. ?fifl fifl? fifl? fl ?flStudents must be familiar with Pearson Edexcel pseudocode, which will be used to frame some of the exam questions
on Paper 2, but they don"t have to use it themselves. Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 116/05/20 3:39 PM
ACTIVITY 5
SEND Enter rst number." TO DISPLAY
RECEIVE rstNumb FROM KEYBOARD
SEND Enter second number." TO DISPLAY
RECEIVE secondNumb FROM KEYBOARD
SET thirdNumb TO rstNumb * secondNumb
SEND thirdNumb TO DISPLAY
Ask the user to enter their username.
Repeat until an existing username is entered.
Next ask the user to enter their password.
Repeat until the correct password is entered.
fi fi flfl?fl fl?? flfl?fl ??flfl? fl flflfl? fi?? fl fl fiS1 The speci?cs of this algorithm should refiect the procedure for borrowing books at the student's own local library or
school library. S2 Table 1.1 describes the function of each of the arithmetic operators. S3 and S4 Variables and constants are explained on page 9. C1 Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 216/05/20 3:39 PM C2SEND 'Enter ?rst number.' TO DISPLAY
RECEIVE ?rstNumb FROM KEYBOARD
SEND 'Enter second number.' TO DISPLAY
RECEIVE secondNumb FROM KEYBOARD
SEND 'Enter third number.' TO DISPLAY
RECEIVE thirdNumb FROM KEYBOARD
SET average TO (?rstNumb + secondNumb + thirdNumb)/3SEND average TO DISPLAY
Sendeni
g cciompou tceripeRvvisevni1R21Rn2RR3i4i
3i4 fi fl fifl fifl??fl?fl
?fl fifl??fl? flflSET mystNumb TO 3
SEND 'Please enter a number between 1 and 10.' TO DISPLAYRECEIVE guess FROM KEYBOARD
IF guess > 10 THEN
SEND 'Too high! Your guess must be between 1 and 10.' TO DISPLAY Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 316/05/20 3:39 PM ELSEIF guess = mystNumb THEN
SEND Well done! You have guessed correctly." TO DISPLAY ELSE SEND Bad luck! The correct number is" & mystNumb TO DISPLAYEND IF
END IF
SCOREOUTPUT
91A56D
78B
The activities in this chapter provide plenty of examples that students can use to illustrate their answer.
SEND Enter your height (in metres)." TO DISPLAYRECEIVE height FROM KEYBOARD
SEND Enter your weight (in kilograms)." TO DISPLAYRECEIVE weight FROM KEYBOARD
SEND Your body mass index (BMI) is:" & weight/height^2 TO DISPL AY (Reminder: height^2 means 'height to the power of 2', i.e. height 2 . See 'Arithmetic operators' on page 9 of the StudentBook.)
Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 416/05/20 3:39 PM 3SORTING AND SEARCHING ALGORITHMS
ACTIVITY 9
The variable
length is used to store the length of the list. The variable switch is initially set to 0.Starting at the beginning of the list, successive pairs of items are compared and swapped round if the rst item is bigger
than the second item. When a swap occurs the value of switch changes from 0 to 1. This process is repeated until the end of the list is reached. fifl fifl fifl fifl fiflfifl flC2 Encourage students to devise appropriate test data to check that the algorithm produces the right outcomes.
Z06 IGCSE Computer Science SB2 Global 10220 UNIT1 Ans.indd 516/05/20 3:39 PM If at the end of a pass through the list the value of switch hasn"t changed from 0 to 1, this indicates that no swaps have taken place, meaning that the list is now sorted. The algorithm then terminates. 4820 9 17 13 21 28 60
4820 9 17 13 21
28
60
48
20 9 17 13 21
28
60
48
20 9 17 13 21
28
60
48
20 17 9 21
13 60
28
48