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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