Loops/Downward for: Difference between revisions
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m (→{{header|ALGOL-M}}: added workaround) |
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=={{header|ALGOL-M}}== |
=={{header|ALGOL-M}}== |
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Sadly, ALGOL-M's FOR statement does not allow a negative value |
Sadly, ALGOL-M's FOR statement does not allow a negative value |
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for STEP, so we have to use a WHILE loop |
for STEP, so in order to count down we either have to use a WHILE loop |
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or move the subtraction into the body of the FOR loop |
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<syntaxhighlight lang="ALGOL"> |
<syntaxhighlight lang="ALGOL"> |
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begin |
begin |
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integer i; |
integer i; |
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write("First approach :"); |
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i := 10; |
i := 10; |
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while (i > 0) do |
while (i >= 0) do |
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begin |
begin |
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writeon(i); |
writeon(i); |
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i := i - 1; |
i := i - 1; |
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end; |
end; |
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write("Second approach:"); |
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for i := 0 step 1 until 10 do |
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writeon(10-i); |
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end |
end |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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10 9 8 7 6 5 4 3 2 1 |
First approach : 10 9 8 7 6 5 4 3 2 1 0 |
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Second approach: 10 9 8 7 6 5 4 3 2 1 0 |
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</pre> |
</pre> |
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