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6.7.2.1 The order of evaluation of the operands of a dyadic operator is implementation-dependent.

In other words, for operators with two operands (left and right) the order in which the operands are evaluated is implementation-dependent. The operands can be evaluation left-to-right, right-to-left, in parallel, or they may not both be evaluated.

Irie Pascal always evaluates the operands of the following operators from left-to-right:

• Addition (+)
• Subtraction (-)
• multiplication (*)
• Real division (/)
• Integer division (div)
• Modulus (mod)
• Is equal (=)
• Is not equal (<>)
• Is less than (<)
• Is less than or equal (<=)
• Is greater than (>)
• Is greater than or equal (>=)
• xor (boolean)
• String concatenation (+)
• Set union (+)
• Set difference (-)
• Set intersection (*)
• Set inclusion (in)
• and (bitwise)
• or (bitwise)
• xor (bitwise)
• Bit shift left (shl)
• Bit shift right (shr)

• and_then (boolean)
• or_else (boolean)

• and (boolean)
• or (boolean)