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<strong>Type</strong> <strong>Checking</strong>• Preliminary step: generalize the concept of operands andoperators to include:– subprograms as operators, and parameters as operands;– assignments as operators, and LHS & RHS as operands.• <strong>Type</strong> checking is the activity of ensuring that the operandsof an operator are of compatible types.• A compatible type is one that is either legal for theoperator, or is allowed under language rules to beimplicitly converted to a legal type:– This automatic conversion , by compiler-generated code, is calleda coercion.Lecture 0546
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