If Statements

Question 1

Asks the user to enter a number,
- Outputs the day that the number represents,
- Validates the number so that an error message displays if the number
is not a valid weekday number.

Answer 1

INPUT number
IF number == 0 THEN
DISPLAY “Monday”
ELSE-IF number == 1 THEN
DISPLAY “Tuesday”
ELSE
DISPLAY “INVALID NUMBER ENTERED”

Question 2

Write an algorithm in pseudocode which:

• asks the user to input 2 numbers
• outputs the larger of the two numbers along with a suitable message

Answer 2

INPUT num1
INPUT num2
IF num1 > num2 THEN
OUTPUT num1 + “is the largest number”
ELSE
OUTPUT num2 + “is the largest number”
END-IF

Question 3

A dog that is 5 years old is equivalent to a 42 year old human. You need to
write a program that converts the age of a dog to the equivalent age of a
human.
Write an algorithm in pseudocode which:
- Asks for the age of the dog in years
- If the age is 2 or less, the human equivalent is 12 times the age
- If the age is more than 2, the human equivalent is 24 for the first 2
years, plus 6 for every additional year.

Answer 3

INPUT dogs_age
IF dogs_age <= 2
human_dog_years = dogs_age * 12
ELSE
extra_years = dogs_age – 2
human_dog_years = 24 + extra_years

Question 4

A taxi firm charges £3 for the first mile and £2 for every mile after that. If
there are 5 or more passengers, an extra 50% is added to the price.
Write an algorithm in pseudocode which calculates the cost of a journey.
The algorithm should:
- Ask the user to enter the number of passengers
- Ask the user to enter the distance (as an integer)
- Calculate the price of the journey
- Output the price on the screen

Answer 4

INPUT Distance
INPUT Passengers
Extra = Distance – 1
CostofExtra = Extra * 2
Cost = 3 + CostofExtra
IF Passengers > 4 THEN
Surcharge = Cost / 2
Cost = Cost + Surcharge
END IF
OUTPUT COST

Question 5

In a factory, the wages earned by a worker is either £2 for every teddy
bear they have made or £5 for every hour they have worked, whichever is
higher.
Write an algorithm in pseudocode which:
- Allows the user to input the number of teddy bears made and the
number of hours worked
- Calculates the wages for the number of teddy bears made
- Calculates the wages for the number of hours worked
- Outputs the larger of the two results.

Answer 5

INPUT TeddyBears
INPUT Hours
PerTeddyBear = 2 * TeddyBears
PerHour = 5 * Hours
IF PerTeddyBear > PerHour THEN
OUTPUT PerTeddyBear
ELSE
OUTPUT PerHour
END IF

Question 6

An isosceles triangle is one which has at least two equal length sides.
Write an algorithm in pseudocode which:
- Asks the user to enter the lengths of a triangle
- Works out if the triangle is isosceles
- Outputs a message stating whether the triangle is isosceles or not.

Answer 6

INPUT Length1, Length2, Length3
IF Length1 = Length2 THEN
Output “Isosceles”
ELSE
IF Length1 = Length3 THEN
Output “Isosceles”
ELSE
IF Length2 = Length 3 THEN
Output “Isosceles”
ELSE
OUTPUT “Not Isosceles”
END IF
END IF
END IF