Converts a number to a decimal-formatted string.
decimalFormat(number)
→ returns string
formattedInt = decimalFormat(123); // 123.00
writeOutput(formattedInt & "<br>");
formattedWithSeparators = decimalFormat(1000000); // 1,000,000.00
writeOutput(formattedWithSeparators & "<br>");
formattedDecimal = decimalFormat(987.15); // 987.15
writeOutput(formattedDecimal & "<br>");
formattedRoundedUp = decimalFormat(456.789); // 456.79 - rounds up
writeOutput(formattedRoundedUp & "<br>");
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