Gold turns into odd decimals after trading, and shared loot loses coins

Sell something at a discount, split a reward among friends, and the purse shows a long string of digits or a coin goes missing. Here is how to keep all money as whole numbers so the saved total is exact, and who gets the odd coin.

Why this works

Money must be countable. Computers cannot hold most decimals exactly, so tiny errors pile up with each trade. Counting in the smallest coin makes every sum exact, and sharing out the leftover coins one by one makes sure none appear or vanish.

When not to use it

Do not insist on whole coins for things that are not really money, such as speed, percentages or a fuel gauge that flows smoothly. Smooth values are fine as decimals. It also adds little to a game with no trading at all.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 25 lines of example code with 3 checks that pass
• How your AI shows you that it works

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Use the Spielerando entry "Gold turns into odd decimals after trading, and shared loot loses coins" (read_entry rpg-gold-in-whole-coins) in my game. Build it step by step, and show me how you checked that it works.

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