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An alternative approach is to use the BigDecimal type, though it is less efficient performance wise.
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import java.math.BigDecimal;
// ...
BigDecimal dollar = new BigDecimal("1.0");
BigDecimal dime = new BigDecimal("0.1");
int number = 7;
System.out.println ("A dollar less " + number + " dimes is $" +
(dollar.subtract( new BigDecimal(number).multiply(dime) )) );
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