Stack Instructions:
PUSH A
PUSH B
SUB
POP X
Is X = A-B
or
X = B-A?
Thank you in advance! 🙂
Stack Instructions: PUSH A PUSH B SUB POP X Is X = A-B or
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In theory,
SUBcould be defined either way (as @delnan says).In practice, most stack-based languages or instruction sets will follow the conventions of Reverse Polish notation:
5 2 -would be3, and can be thought of in terms of stack operations aspush 5; push 2; subtract. So, in your example,X = A-Bwould be the more typical expected result.(A real example:
isubin the JVM.)