Answer :
EVALUATE_PREFIX(STRING)
Step 1: Start by picking up literals from the end
Step 2: If element is an operand push it to Stack
Step 3: If the element is an operator pop two elements from the Stack.
Operate on these elements according to the operator, and push the result back to the Stack
Step 4: Move left and process elements as shown in step 2 and 3 until all are scanned in the expression.
Step 5: The Result is stored at the top of the Stack
Explanation :
+ 10 * 5 4
1. Push 4 to stack
2. Push 5 to stack. Stack contains
5 |
4 |
3. * is operator. Pop two elements, multiply and push to stack. Stack contains
20 |
4. Push 10 to stack. Stack contains
10 |
20 |
5. + is operator. Pop two elements, add and push to stack. Stack contains
30 |
6. Result is 30
QUICK ANSWER PLS What is the result of the following prefix expression? + 10 + 54
don't answer if not very sure pls
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could you help me with these
questions pls
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