Strange numbers: Difference between revisions
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(Added Algol 68) |
(→{{header|ALGOL W}}: Simplify - treat single digit numbers as strange, as in other samples) |
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=={{header|ALGOL W}}== |
=={{header|ALGOL W}}== |
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<syntaxhighlight lang="algolw"> |
<syntaxhighlight lang="algolw"> |
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begin % find "strange numbers" - numbers where digits differ from the next % |
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% by a prime % |
% by a prime % |
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% returns true if n is strange, false otherwise % |
% returns true if n is strange, false otherwise % |
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logical procedure isStrange( integer value n ) ; |
logical procedure isStrange( integer value n ) ; |
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begin |
begin |
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integer rest; |
integer rest, d0; |
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| ⚫ | |||
rest := abs( n ); |
rest := abs( n ); |
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strange := true; |
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d0 := rest rem 10; |
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rest := rest div 10; |
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while strange and rest > 0 do begin |
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integer d1, diff; |
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d1 := rest rem 10; |
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rest := rest div 10; |
rest := rest div 10; |
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diff := abs( d1 - d0 ); |
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strange := diff = 2 or diff = 3 or diff = 5 or diff = 7; |
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d0 := d1 |
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| ⚫ | |||
rest := rest div 10; |
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strange |
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diff := abs( d1 - d0 ); |
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strange := diff = 2 or diff = 3 or diff = 5 or diff = 7; |
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d0 := d1 |
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| ⚫ | |||
| ⚫ | |||
end if_rest_lt_10__ |
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end isStrange ; |
end isStrange ; |
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% test the isStrange procedure on values |
% test the isStrange procedure on values 101-499 % |
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begin |
begin |
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integer strangeCount; |
integer strangeCount; |
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strangeCount := 0; |
strangeCount := 0; |
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for n := |
for n := 101 until 499 do begin; |
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if isStrange( n ) then begin |
if isStrange( n ) then begin |
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strangeCount := strangeCount + 1; |
strangeCount := strangeCount + 1; |
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end for_n |
end for_n |
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end |
end |
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end. |
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</syntaxhighlight> |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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