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Description

When the - operator has two operands of integral type or real type it performs subtraction, according to the following rules:

First the numeric type conversion rules are applied. After applying the numeric type conversion rules, the operands are either both of integer type, or both of word type or both of real type, or both of address type or one operand is of address type and the other operand is not.

• If both operands are of integer type then unsigned integer subtraction is performed, and the result is a value of type integer.
• If both operands are of word type then unsigned integer subtraction is performed, and the result is a value of type word.
• If both operands are of real type then real (i.e floating point) subtraction is performed, and the result is a value of type real.
• If both operands are of address type then unsigned integer subtraction is performed, and the result is a value of type integer.
• If one operand is of address type and the other operand is not then unsigned integer subtraction is performed, and the result is a value of address type.

Example

Here are some examples using the - operator to perform subtraction:

   3 - 5      which results in the integer value -2
   3 - 5.0    which results in the real value -2.0
   3.0 - 5    which results in the real value -2.0
   3.0 - 5.0  which results in the real value -2.0