Loops/Increment loop index within loop body: Difference between revisions

Content added Content deleted

Inline

@@ Line 2,133: / Line 2,133: @@
 Same as 'while' loop version.
 </pre>
+=={{header|Lua}}==
+<lang lua>-- Returns boolean indicate whether x is prime
+function isPrime (x)
+  if x < 2 then return false end
+  if x < 4 then return true end
+  if x % 2 == 0 then return false end
+  for d = 3, math.sqrt(x), 2 do
+    if x % d == 0 then return false end
+  end
+  return true
+end
+-- Main procedure
+local n, i = 0, 42
+while n < 42 do
+  if isPrime(i) then
+    n = n + 1
+    print("n = " .. n, i)
+    i = 2 * i - 1
+  end
+  i = i + 1
+end</lang>
+{{out}}
+<pre>n = 1   43
+n = 2   89
+n = 3   179
+n = 4   359
+n = 5   719
+n = 6   1439
+n = 7   2879
+n = 8   5779
+n = 9   11579
+n = 10  23159
+n = 11  46327
+n = 12  92657
+n = 13  185323
+n = 14  370661
+n = 15  741337
+n = 16  1482707
+n = 17  2965421
+n = 18  5930887
+n = 19  11861791
+n = 20  23723597
+n = 21  47447201
+n = 22  94894427
+n = 23  189788857
+n = 24  379577741
+n = 25  759155483
+n = 26  1518310967
+n = 27  3036621941
+n = 28  6073243889
+n = 29  12146487779
+n = 30  24292975649
+n = 31  48585951311
+n = 32  97171902629
+n = 33  194343805267
+n = 34  388687610539
+n = 35  777375221081
+n = 36  1554750442183
+n = 37  3109500884389
+n = 38  6219001768781
+n = 39  12438003537571
+n = 40  24876007075181
+n = 41  49752014150467
+n = 42  99504028301131</pre>
 =={{header|M2000 Interpreter}}==