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1 version.4i is a simple program that tests what version of INTERCAL you are
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2 running.
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3
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4 Under INTERCAL-72, the .4i suffix is ignored, and the COME FROM lines are
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5 splatted. So execution flows to the first splat line, where an error is
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6 reported that prints out the required message.
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7
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8 Under C-INTERCAL (or CLC-INTERCAL faking it), the ? is interpreted as XOR,
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9 leaving a hugely large value in .1. So the second COME FROM doesn't match,
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10 and the second splat line generates the error.
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11
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12 Under CLC-INTERCAL (or C-INTERCAL using the -X option), the ? is interpreted
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13 as BUT, leaving #5 in .1. So the second COME FROM finds the required line
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14 label, and the third splat line generates the error.
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