3a13724a706885adccf321f5f39128887a6b8648
Don't use variables that start with an underscore. They're reserved for the system. Using single-letter variable names is fine for simple for() counters, but don't use them for real variables. Here you probably meant "Coins", "CoinsPerCredit" (const) and "Remainder". Er, you're implementing div and mod iteratively. :)
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