Mixed Type Numeric Expressions

In the CPU calculations must be performed between objects of the same type, so if an expression mixes type some objects must change type.

Default types have an implied ordering:

1. INTEGER -- lowest
2. REAL
3. DOUBLE PRECISION
4. COMPLEX -- highest

The result of an expression is always of the highest type, for example,

• INTEGER * REAL gives a REAL, (3*2.0 is 6.0)
• REAL * INTEGER gives a REAL, (3.0*2 is 6.0)
• DOUBLE PRECISION * REAL gives DOUBLE PRECISION,
• COMPLEX * < anytype > gives COMPLEX,
• DOUBLE PRECISION * REAL * INTEGER gives DOUBLE PRECISION.

The actual operator is unimportant.

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