45 lines
1.1 KiB
Plaintext
45 lines
1.1 KiB
Plaintext
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**FREE
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Ctl-Opt Main(ThreeNPlusOne);
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Dcl-Proc ThreeNPlusOne;
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Dcl-S n Packed(10);
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Dcl-S counter Int(10) Inz(0);
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Dcl-S input_prompt VarChar(50) Inz('Enter a positive integer (or 0 to exit):');
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// Use an infinite loop, exit when user enters 0
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Dow (1 = 1);
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Dsply input_prompt ' ' n;
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If n = 0;
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Leave;
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EndIf;
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If n < 0;
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input_prompt = 'Positive integers only. Enter a number:';
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Iter;
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EndIf;
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// Start sequence calculation
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input_prompt = 'Enter a positive integer (or 0 to exit):'; // Reset prompt
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counter = 0;
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Dsply ('Sequence for ' + %Char(n) + ':');
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Dow n > 1;
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If %Rem(n:2) = 0;
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// n is even, divide by 2
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n = n / 2;
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Else;
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// n is odd, multiply by 3 and add 1
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n = (n * 3) + 1;
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EndIf;
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counter = counter + 1;
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Dsply %Char(n);
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EndDo;
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Dsply ('Reached 1 in ' + %Char(counter) + ' iterations.');
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Dsply ' '; // Add a blank line for readability
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EndDo;
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End-Proc ThreeNPlusOne;
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