In computer engineering and in programming language implementations, a stack machine is a real or emulated computer that uses a pushdown stack rather than individual machine registers to evaluate each sub-expression in the program. A stack computer is programmed with a reverse Polish notation instruction set.
The common alternative to stack machines are register machines, in which each instruction explicitly names the specific registers to use for operand and result values.
Read more about Stack Machine: Practical Expression-Stack Machines, Computers Using Call Stacks and Stack Frames
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