KwickClips Java · 39 sec · free
What do you do when you read an operand?
Short answer. Push it on the stack.
What is the value of 2 3 4 * +?
14.
Evaluate 2 3 4 * +
| Read | Stack |
|---|---|
| 2 3 4 | 2 3 4 |
| * | 2 12 |
| + | 14 |
Remember
| Operand: push |
| Operator: pop two, push result |
Can you solve two three four star plus? Push two, three and four. Star pops four and three, pushes twelve. Plus pops twelve and two. Answer fourteen. Push operands. At an operator, pop two and push the result.
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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Which popped value is the left operand?43 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy