Mark has a small glasshouse. He lives in a warm country where plants can die if they are left without water for too long. The glasshouse has a microprocessor controlled sprinkler system and a moisture sensor in the soil. Complete this flowchart to show the processing required to control the level of moisture in the soil of the glasshouse. You may assume that a pre-set value, dry, has already been input so that the system can test if the amount of moisture in the soil has reached or fallen below a certain level. The user activates the microprocessor system by pressing a switch. Complete the flowchart which inputs the moisture reading in the glasshouse and switches the sprinkler on and off according to this value. It also checks if the sprinkler is already on or off before attempting to switch it on or off. Start Is the system activated? is mlevel > dry? is sprinkler on? Stop Flowcharts often contain subroutines. Draw the symbol used to represent a subroutine in a flowchart. State what you would expect to see in the first box of a subroutine.

9626_m23_qp_12

THEORY

2023

Paper 1, Variant 2

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A program written in a simple high level programming language has a mistake in it. Line 20 should say LET A = X + Y, but the program was typed as: 10 INPUT X, Y 20 LE A = X + Y 30 PRINT X, " + ",Y, " = ", A 40 END Describe the two ways the program, including the error, could be translated so that it runs on a computer.

9626_s20_qp_13

THEORY

2020

Paper 1, Variant 3

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Josefine has started to draw a flowchart which inputs 10 numbers and outputs the largest value. Complete the flowchart by filling in the empty boxes and by placing yes and no as appropriate in the diagram. Start Stop count 0 max 0 Input number

9626_s22_qp_12

THEORY

2022

Paper 1, Variant 2

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Complete the flowchart below to add up 6 numbers. Use the variable total to store the sum of the numbers and the variable count to control the number of times the loop is repeated. Start Stop INPUT number

9626_s22_qp_13

THEORY

2022

Paper 1, Variant 3

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Complete this flowchart which will allow the input of ten numbers. • A number is even if the number divided by 2 is an integer. • If a number (N) is odd, it will be added to the odd total (OT). • If a number (N) is even, it will be added to the even total (ET). • Both these totals will be output after the tenth number has been processed. Start Stop count count + 1 ET ET + N

9626_s23_qp_11

THEORY

2023

Paper 1, Variant 1

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Draw a program flowchart, in the space provided, that will allow an examination mark to be entered and then output an appropriate message giving the correct grade, as shown in the table. All marks are integers. Mark Message 85 or more Grade A 70 or more Grade B 50 or more Grade C Any other mark Grade U

9626_s24_qp_13

THEORY

2024

Paper 1, Variant 3

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Describe how a system flowchart is constructed.

9626_s24_qp_31

THEORY

2024

Paper 3, Variant 1

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Describe how a system flowchart is constructed.

9626_s24_qp_33

THEORY

2024

Paper 3, Variant 3

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A company pays its workers weekly. The payroll department collects the data about the workers and stores it in a transaction file. At the end of the week, the transaction file is used to update the master file. Draw a system flowchart which shows how the transaction file and master file are used to produce the payslips for the workers.

9626_w17_qp_32

THEORY

2017

Paper 3, Variant 2

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Describe the roles of a compiler and a linker and explain why both might be necessary in the conversion of a high-level language program.

9626_w20_qp_12

THEORY

2020

Paper 1, Variant 2

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