Summary of Expression Types

Expression	Arithmetic meaning
1 + 2	Addition, the result is 3
3 * 4	Multiplication, the result is 12
1 / 3	Integer division, the result is 0 in older Python environments, but 0.333333333333 in Python 3
2.0 / 4.0	Division, the result is 0.5, since you are using decimal numbers in the calculation
2 % 3	Modulo (remainder), the result is 2
-1	Negation, the result is -1

csp-3-4-1: What is the result of 3 / 4?

• 0
• If the two values are both integers (whole numbers) you will normally get an integer (whole number) result in older Python environments. But, this book is using Python 3 so you get a decimal result.
• 1
• This would be correct if the result was rounded up before the values after the decimal point were thrown away, but it does not do this.
• 0.75
• While this isn't the what older Pyton development environments would return, in this book we are using Python 3 so it returns a decimal result.
• 0.25
• This would be correct if it was 1 / 4, 1.0 / 4, or 1 / 4.0

csp-3-4-2: What is the result of 18 % 5?

• 0
• This would be correct if it was 18 % 2, but what is the remainder of 18 divided by 5?
• 1
• This would be correct if it was 18 % 17, since 17 goes into 18 one time and the remainder is 18 - 17 = 1.
• 2
• What is the highest multiple of 5 that is less than or equal to 18? The remainder is 18 - that number.
• 3
• The reminder is 3 since 5 goes into 18 three times (15) and 18 - 15 = 3.

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csp-3-4-3: What is the result of 2 % 6?

• 0
• This would be correct if it was 6 % 2.
• 1
• This would be correct if it was some odd number divided by 2, but it is not.
• 2
• 6 goes into 2 zero times with 2 left over.
• 6
• If you have a smaller number divided by a larger number the remainder is always the smaller number.

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