Arithmetic: Difference between revisions
Created page with "Notes on basic math operations. =Integers= ==Division== Given 2 integers <code>n</code>, <code>m</code>, integer division returns the integer portion of the divided value.<br> This is floored result of true-division for positive numbers. In C, this rounds to zero but Python rounds down.<br> E.g. 5/2 returns 2 <pre> # Round down n/m # To round up always (n + m - 1) / m # To round to nearest (n + (m/2)) + m </pre> =Rounding=" |
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Notes on basic math operations. | Notes on basic math operations and computer primitives. | ||
=Integers= | ==Integers== | ||
==Division== | ===Division=== | ||
Given 2 integers <code>n</code>, <code>m</code>, integer division returns the integer portion of the divided value.<br> | Given 2 integers <code>n</code>, <code>m</code>, integer division returns the integer portion of the divided value.<br> | ||
This is floored result of true-division for positive numbers. In C, this rounds to zero but Python rounds down.<br> | This is floored result of true-division for positive numbers. In C, this rounds to zero but Python rounds down.<br> | ||
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</pre> | </pre> | ||
=Rounding= | ==Floats== | ||
==Rounding== | |||
Types of rounding | |||
* Round towards zero | |||
* Round down, i.e. towards negative infinity | |||
Latest revision as of 16:02, 7 January 2022
Notes on basic math operations and computer primitives.
Integers
Division
Given 2 integers n, m, integer division returns the integer portion of the divided value.
This is floored result of true-division for positive numbers. In C, this rounds to zero but Python rounds down.
E.g. 5/2 returns 2
# Round down n/m # To round up always (n + m - 1) / m # To round to nearest (n + (m/2)) + m
Floats
Rounding
Types of rounding
- Round towards zero
- Round down, i.e. towards negative infinity