Chapter 9 - Pseudocode Notes

1. Average Calculation

Total <-- 0
PRINT "Enter the number of values to average"
INPUT Number
FOR Counter <-- 1 TO Number
    PRINT "Enter value"
    INPUT Value
    Total <-- Total + Value
NEXT Counter
Average <-- Total/Number
PRINT "The average of", Number, "values is", Average

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2. Basic Operations & String Handling

INPUT StudentName
OUTPUT "You have made an error"
Counter <-- 1
Counter <-- Counter + 1
MyChar <-- "A"
LetterValue <-- ASC(MyChar)
StudentMark <-- 40
Percentage <-- (StudentMark/80) * 100
OldString <-- "Your mark is"
NewString <-- OldString & "ninety-seven"

Operators:

• + Addition
• - Subtraction
• * Multiplication
• / Division
• & String concatenation
• <-- Assignment

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3. IF Statement (Single Condition)

IF MyValue > YourValue THEN
    OUTPUT "I win"
ENDIF

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4. IF…ELSE Statement

IF MyValue > YourValue THEN
    OUTPUT "I win"
ELSE
    OUTPUT "You win"
ENDIF

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5. CASE Statement (No Otherwise)

CASE OF Direction
 "N": Y <-- Y + 1
 "S": Y <-- Y - 1
 "E": X <-- X + 1
 "W": X <-- X - 1
ENDCASE

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6. CASE Statement (With Otherwise)

CASE OF Direction
 "N": Y <-- Y + 1
 "S": Y <-- Y - 1
 "E": X <-- X + 1
 "W": X <-- X - 1
 OTHERWISE: OUTPUT "Error"
ENDCASE

Relational Operators:

• = Equal to
• <> Not equal to
• > Greater than
• < Less than
• >= Greater than or equal to
• <= Less than or equal to

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7. FOR Loop (Summation)

Total <-- 0
FOR Counter <-- 1 TO 10
    OUTPUT "Enter a number"
    INPUT Number
    Total <-- Total + Number
NEXT Counter
OUTPUT "The total is", Total

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8. REPEAT…UNTIL Loop (Positive Number)

REPEAT
    OUTPUT "Please enter a positive number"
    INPUT Number
UNTIL Number > 0

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9. WHILE Loop (Negative Number)

Number <-- 0
WHILE Number >= 0 DO
    OUTPUT "Please enter a negative number"
    INPUT Number
ENDWHILE

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10. REPEAT…UNTIL with AND Condition

REPEAT
    OUTPUT "Please enter a positive number less than fifty"
    INPUT Number
UNTIL (Number > 0) AND (Number < 50)

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11. Validated Average Calculation

Total <-- 0
REPEAT
    PRINT "Enter the number of values to average"
    INPUT Number
UNTIL (Number > 0) AND (Number = INT(Number))
FOR Counter <-- 1 TO Number
    REPEAT
        PRINT "Enter an integer value"
        INPUT Value
    UNTIL Value = INT(Value)
    Total <-- Total + Value
NEXT Counter
Average <-- Total/Number
PRINT "The average of", Number, "values is", Average

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12. Marathon Time Conversion

OUTPUT "Enter the time you took to run the marathon"
OUTPUT "Enter hours"
INPUT MarathonHours
OUTPUT "Enter minutes"
INPUT MarathonMinutes
OUTPUT "Enter seconds"
INPUT MarathonSeconds
TotalMarathonTimeSeconds <-- (MarathonHours * 3600) + (MarathonMinutes * 60) + MarathonSeconds
OUTPUT "Time for marathon in seconds", TotalMarathonTimeSeconds