# new here

Discussion in 'Meet and Greet' started by faridah, Mar 30, 2011.

1. ### faridahNew Member

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well im new here...haha
i need to make a project in C++
using queue
well im kinda new 2 all these programming stuff
anybody can help me...
here is, the question

QUESTION:
One way to evaluate a prefix expression is to use queue. To evaluate the expression, scan it repeatedly until you know the final expression value. In each scan read the token are store them in queue. In each scan, replace an operator followed by two operands by two expression is a prefix expression that is calculated to 159:
- + * 9 + 2 8 * + 4 8 6 3
We can scan the expression and store it in queue. During the scan, when an operator is followed by two operands, such as + 2 8, we put the result, 10, in the queue.
After the first scan, we have
- + * 9 + 10 * + 12 6 3
After the second scan, we have

- + 90 72 3
After the third scan, we have

- 162 3
After the fourth scan, we have

159

2. ### Akbar AliNew Member

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This is right