# Summary of Expression TypesΒΆ

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 |

- 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-3-4-1: What is the result of `3 / 4`

?

- 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.

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

?

- 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.

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

?

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