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

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

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of instructions being executing on the microprocessor
 keeps the address of the next instruction to be fetched
 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack

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