Expressions (COPY) 
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XPL0, like many computer languages, is a mathematical language. It does arithmetic and other operations on numbers. Expressions consist of factors and operators. Operators perform on anything that has a value, such as constants, variables, and subexpressions. An expression calculates to a single value. In XPL0, an expression can be used anywhere a value is used and vice versa.
Here is detailed information about expressions:
