Java lib for parsing and evaluating simple math expressions, using fractions. This was a seminar project in a Programming class. It is not very useful, but works
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rcalc/src/net/mightypork/rcalc/tokens/TokenUnaryOperatorLeft.java

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package net.mightypork.rcalc.tokens;
import net.mightypork.rcalc.TokenList;
import net.mightypork.rcalc.operations.Operation;
/**
* Abstract operator token with one operand on left
*
* @author Ondrej Hruska
*/
public abstract class TokenUnaryOperatorLeft extends TokenOperator {
/**
* Convert to operation
*
* @param operand operand
* @return operation
*/
public abstract Operation toOperation(TokenList operand);
}