Anonymous user
Shoelace formula for polygonal area: Difference between revisions
Shoelace formula for polygonal area (view source)
Revision as of 22:27, 26 October 2019
, 4 years ago→{{header|Modula-2}}
m (→{{header|REXX}}: changed whitespace and comments, simplified code, elided use of temporary variables.) |
|||
Line 849:
ReadChar;
END ShoelaceFormula.</lang>
=={{header|Nim}}==
<lang nim>import math
type
Point = tuple
x: float
y: float
func shoelace(points: openArray[Point]): float =
var leftSum, rightSum = 0.0
for i in 0..<len(points):
var j = (i + 1) mod len(points)
leftSum += points[i].x * points[j].y
rightSum += points[j].x * points[i].y
0.5 * abs(leftSum - rightSum)
var points = [(3.0, 4.0), (5.0, 11.0), (12.0, 8.0), (9.0, 5.0), (5.0, 6.0)]
echo $shoelace(points)</lang>
{{out}}
<pre>
30.0
</pre>
=={{header|Perl}}==
| |||