Hourglass puzzle: Difference between revisions

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=={{header|REXX}}==

<lang rexx>/*REXX program determines if there is a solution to measure 9 minutes using a */

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say "Turn over both sandglasses (at the same time) and continue"

say "flipping them each when the sandglasses individually run down"

say "until the four-minute glass is flipped {t4//4} times,"

say "until the four-minute glass is flipped " t4%4 ' times,'

say "whereupon the seven-minute glass is immediately placed on its"

say "side with {t7_left} minutes of sand in it."

say "side with " t7_left ' minutes of sand in it.'

say

say "You can measure 9 minutes by flipping the four-minute glass"

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Turn over both sandglasses (at the same time) and continue

flipping them each when the sandglasses individually run down

until the four-minute glass is flipped ~~{t4//~~4} times,

until the four-minute glass is flipped 4 times,

whereupon the seven-minute glass is immediately placed on its

side with ~~{t7_left}~~ minutes of sand in it.

side with 5 minutes of sand in it.

You can measure 9 minutes by flipping the four-minute glass