Writing precise conditions (7a)

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Quick Questions

Shade in the A or B circle for each question.

1. Which condition is written precisely enough for an exam answer?

A Age >= 18

B Age is old enough

2. Which condition uses a relational symbol instead of words?

A Score > HighScore

B Score is greater than HighScore

3. Which condition names the exact variable being tested?

A IF the mark is high enough THEN

B IF Mark >= 50 THEN

4. A password must have at least 8 characters. Which condition is correct?

A LENGTH(Password) >= 8

B LENGTH(Password) > 8

5. A user must be older than 12. Which condition is correct?

A Age >= 12

B Age > 12

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Score >= 50		AAge > 16
2Age <> 18		BTemperature >= 100
3To test that a student must be older than 16 (16 itself does not count), write the symbol and the exact value		CA precise condition: true when Score is 50 or more, so 50 itself passes
4To test that a temperature is at least 100, include 100 itself by using the symbol for greater than or equal to		DA precise condition: true when Age is anything other than 18
5IF Mark is greater than 50 THEN		EThe condition uses words instead of a relational symbol, so it is too vague and loses marks. It should be IF Mark > 50 THEN.
6IF Age >= 18 THEN (when the rule says over 18)		FThe wrong symbol is used. 'Over 18' means 18 does not count, so it should be Age > 18, not Age >= 18.

Definitions

Age >= 18

Fill in the Blanks

Complete each line of code by filling in the missing parts.

IF Age __ 18 THEN OUTPUT "Adult" ENDIF

IF ____ > 40 THEN OUTPUT "Mark above 40" ENDIF

IF Quantity _ 10 THEN OUTPUT "Low stock" ENDIF

IF Age __ 5 THEN OUTPUT "Free entry" ENDIF

IF Score >= 0 ___ Score <= 100 THEN OUTPUT "Valid" ENDIF

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A INPUT Mark

B Pass ← FALSE

C IF Mark is at least 50 THEN

D Pass ← TRUE

E ENDIF

Question 2

A REPEAT

B OUTPUT "Enter a number"

C INPUT Num

D UNTIL Num is between 1 and 10

Question 3

A IF Temp greater than 30 THEN

B OUTPUT "Hot"

C ENDIF

Question 4

A INPUT Items

B // Free delivery for 5 or more

C Free ← FALSE

D IF Items > 5 THEN

E Free ← TRUE

F ENDIF

Question 5

A INPUT Height

B IF the height >= 140 THEN

C OUTPUT "Can ride"

D ENDIF

Answer Key

Writing precise conditions (7a)

Section A: Quick Questions

A — Age >= 18

A — Score > HighScore

B — IF Mark >= 50 THEN

A — LENGTH(Password) >= 8

B — Age > 12

Section B: Match the Pairs

Score >= 50 → A precise condition: true when Score is 50 or more, so 50 itself passes

Age <> 18 → A precise condition: true when Age is anything other than 18

To test that a student must be older than 16 (16 itself does not count), write the symbol and the exact value → Age > 16

To test that a temperature is at least 100, include 100 itself by using the symbol for greater than or equal to → Temperature >= 100

IF Mark is greater than 50 THEN → The condition uses words instead of a relational symbol, so it is too vague and loses marks. It should be IF Mark > 50 THEN.

IF Age >= 18 THEN (when the rule says over 18) → The wrong symbol is used. 'Over 18' means 18 does not count, so it should be Age > 18, not Age >= 18.

Section C: Definitions

Age >= 18 — A precise condition uses a relational symbol and exact values, like Age >= 18. Words such as 'Age is old enough' or 'greater than' are too vague and lose marks.

Section D: Fill in the Blanks

IF Age >= 18 THEN
   OUTPUT "Adult"
ENDIF

IF Mark > 40 THEN
   OUTPUT "Mark above 40"
ENDIF

IF Quantity < 10 THEN
   OUTPUT "Low stock"
ENDIF

IF Age <= 5 THEN
   OUTPUT "Free entry"
ENDIF

IF Score >= 0 AND Score <= 100 THEN
   OUTPUT "Valid"
ENDIF

Section E: Spot the Error

C — The condition uses words ('is at least') instead of a relational symbol. It should be IF Mark >= 50 THEN.

D — 'is between 1 and 10' is wording, not a precise condition. Use symbols and repeat the variable: UNTIL Num >= 1 AND Num <= 10.

A — 'greater than' is written in words. A precise condition uses the symbol: IF Temp > 30 THEN.

D — '5 or more' includes 5, so the condition needs >=. Using > wrongly leaves out exactly 5 items. It should be IF Items >= 5 THEN.

B — The condition must name the exact variable, Height, as it was declared and input. 'the height' is not an identifier. It should be IF Height >= 140 THEN.