Microprocessor
In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

Arithmetic, relational, assignment
Relational, assignment, arithmetic
Assignment, relational, arithmetic
Arithmetic, assignment, relational

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Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the data word stored at the operand address.
 shorthand for machine language.
 a short abbreviation for the operation to be performed.
 a short abbreviation for the operand address.

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