Evaluate PreFix Expression

We have already written algorithm to convert infix expression to post fix expression. You can refer my previous post for the same. As we have already having a prefix expression and that is well known to computer, let's directly jump on to the algorithm. Algorithm: Reverse the expression. Tokenize the expression depending on the delemeter. Perform the following operations on each token. If...

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Evaluate Post Fix Expression

We have already written algorithm to convert infix expression to post fix expression. You can refer my previous post for the same. As we have already having a post fix expression and that is well known to computer, let's directly jump on to the algorithm. Algorithm: Tokenize the expression depending on the delemeter. Perform the following operations on each token. If token is operand, push the...

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Evaluate a mathematics expression in java

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Infix to Prefix

In my previous post we evaluated the algorithm to convert a prefix expression to post fix expression. Infix to Post fix algorithm is going to be handy for writing the algorithm of Infix to Prefix. We just need few additional steps to do so. But before jumping on to the solution for computer program, let's first solve it in a mathematical way.  Before just jumping on to the algorithm and...

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Infix to Post Fix

Before just jumping on to the algorithm and implementation, let's start slow. I am going to convert a infix expression first in a traditional mathematical way and then will derive the algorithm using computer language. Let me start with a simple example. Order Of Operation  Parenthesis - ( ) { } [ ]  Exponent (Right to left) Multiplication and Division (Left to Right) Addition...

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