Identify Errors in Algorithms (OCR GCSE Computer Science)

age = input("Enter age)

favNum == input("Enter favourite number")

print age + favNum)

print (age x favNum)

age = input("Enter age") # Missing "

favNum = input("Enter favourite number")
# Only one equal sign

print (age + favNum) # Missing bracket

print (age * favNum) # Multiply symbol is *

num1 = imput("Enter the first number")

num2 = input(Enter the second number)

if num1 > num2 then

print(num1 + " is larger")

elseif num2 > num1 then

  Print(num2 + " is larger")

else

  print("The numbers are the same")

endif

num1 = input("Enter the first number") # Misspelt word 

num2 = input("Enter the second number") # Missing quotes

if num1 > num2 then

  print(num1 + " is larger") # Block not indented

elseif num2 > num1 then

  print(num2 + " is larger") # Lowercase p

else

  print("The numbers are the same")

endif

miles = input("Enter the number of miles)

 cost = 0.3

 if cost = 10 then

cost = cost * 0.1

 endif

 print(cost)

miles = input("Enter the number of miles")

cost = miles * 0.3

if cost > 10 then

cost = cost * 0.9

endif

print(cost)

Commentary

• The cost was set to 0.3 (30p) instead of correctly calculating the cost of the trip by applying the formula, miles * 0.3

• The cost should only be reduced if the cost is greater than 10, in the original algorithm it only checked if the cost was equal to 10

• To calculate a discount of 10%, either calculate what 10% is and subtract it from the original or multiply the full cost by 0.9. In the original algorithm it calculates what 10% is and sets the cost to equal it.