## Expressions

An expression is any combination of keywords, operators, functions, and constant values that result in a value of a given type. For example:

    //An expression that evaluates to the Number value 25
    10 + 20 - 5
    //An expression that evaluates to the String value
    //"This is a string."
    "This is a string."

A Crystal syntax formula consists of a sequence of expressions. The value of the final expression is the value returned by the formula and what gets printed. Each expression must be separated from the previous expression by a semicolon (;).

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