KwickClips Java · 43 sec · free
Which popped value is the left operand?
Short answer. The second one popped.
What is the prefix form of (A + B) * C?
* + A B C.
Exam favourite
| Question | Answer |
|---|---|
| 8 2 - | 6 |
| (A+B)*C post | AB+C* |
| (A+B)*C pre | *+ABC |
Remember
| Second popped is left operand |
| Show stack after each step |
Eight two minus. Is it six or minus six? Pop two, then eight. Eight is on the left, so six. Bracket A plus B into C gives A B plus C star. Prefix is star plus A B C. The second value popped is on the left. Show the stack at every step.
This clip is from the full lesson: Infix, Prefix and Postfix Expressions — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 9 Computer Applications, ISC Class 12 Computer Science (868)
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