Create an Java Postfix converter using the algorithm provided. Thank you
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Create an Java Postfix converter using the
Thank you
Transcribed Image Text:Algorithm convertToPostfix (infix)
11 Converts an infix expression to an equivalent postfix expression.
operatorStack = a new empty stack
postfix = a new empty string
while (infix has characters left to parse)
{
nextCharacter = next nonblank character of infix
switch (nextCharacter)
{
}
}
while
{
case variable:
Append nextCharacter to postfix
break
case 'Λ'
operatorStack.push(nextCharacter)
break
case '+': case
: case
while (!operatorStack.isEmpty() and
precedence of nextCharacter <= precedence of operatorStack.peek ())
Append operatorStack. peek () to postfix
operatorStack.pop()
{
}
break
case '(':
I
operatorStack.push(nextCharacter)
I* I
operatorStack.push(nextCharacter)
break
case ')': // Stack is not empty if infix expression is valid
operatorStack.pop()
=
topOperator
while (topOperator != '(')
{
: case '/' :
Append topOperator to postfix
topOperator = operatorStack.pop()
(!operatorStack.isEmpty())
}
break
default: break // Ignore unexpected characters
}
return postfix
topOperator = operatorStack.pop()
Append topOperator to postfix
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