Predefined Functions (SQA National 5 Computing Science): Revision Note

Random

SET number TO RANDOM(1, 100)

import random

number = random.randint(1,100)

Will pick a number between 1 and 100

DECLARE LotteryNumbers : ARRAY[1:49] OF INTEGER
DECLARE ChosenNumbers : ARRAY[1:6] OF INTEGER
DECLARE RandomIndex, Number, i, j, Temp : INTEGER

// Populate the LotteryNumbers array
FOR Index FROM 1 TO 49 DO
    SET LotteryNumbers[Index] TO Index
END FOR

// Choose 6 random numbers
FOR Count FROM 1 TO 6 DO
    SET RandomIndex TO ROUND(RANDOM() * (50 - Count), 0)
    IF RandomIndex = 0 THEN
        SET RandomIndex TO 1
    END IF

    SET Number TO LotteryNumbers[RandomIndex]
    SET ChosenNumbers[Count] TO Number

    // Remove chosen number from available list
    FOR i FROM RandomIndex TO 48 DO
        SET LotteryNumbers[i] TO LotteryNumbers[i + 1]
    END FOR
END FOR

// Sort chosen numbers into ascending order
FOR i FROM 1 TO 5 DO
    FOR j FROM i + 1 TO 6 DO
        IF ChosenNumbers[i] > ChosenNumbers[j] THEN
            SET Temp TO ChosenNumbers[i]
            SET ChosenNumbers[i] TO ChosenNumbers[j]
            SET ChosenNumbers[j] TO Temp
        END IF
    END FOR
END FOR

// Display the winning numbers
SEND "The winning numbers are:" TO DISPLAY
FOR i FROM 1 TO 6 DO
    SEND ChosenNumbers[i] TO DISPLAY
END FOR

import random

# Create a list of numbers for the national lottery
lottery_numbers = list(range(1, 50))

# Create an empty list to store the chosen numbers
chosen_numbers = []

# Loop to pick 6 numbers from the list
for _ in range(6):
    # Use random.choice to pick a number from the list
    number = random.choice(lottery_numbers)

    # Add the chosen number to the list of chosen numbers
    chosen_numbers.append(number)

    # Remove the chosen number from the list of available numbers
    lottery_numbers.remove(number)

# Sort the chosen numbers in ascending order
chosen_numbers.sort()

# Output the chosen numbers
print("The winning numbers are:", chosen_numbers)

Round

pi = 3.14159

SET rounded TO ROUND(pi, 2)

SEND rounded TO DISPLAY

// Outputs 3.14

number = 3.14159 rounded_number = round(number, 2)
print(rounded_number)
# Outputs 3.14

Will round the value of pi to 2 decimal places

DECLARE Price : REAL
DECLARE RoundedPrice : REAL

SET Price TO 12.6789

// Round the value of Price to 2 decimal places
SET RoundedPrice TO ROUND(Price, 2)

SEND "The rounded price is " & RoundedPrice TO DISPLAY

# Declare and assign values
price = 12.6789

# Round the value of price to 2 decimal places
rounded_price = round(price, 2)

# Output the result
print("The rounded price is", rounded_price)

Length

SET strLength TO LENGTH (str)

number = 3.14159 rounded_number = round(number, 2)
print(rounded_number)
# Outputs 3.14

Stores the length of a string in the variable named strLength