Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Create an appropriate Java Postfix calculator class using th ealgorithm below. Your program should accept at least five elements (data1, data2, data3, data4, data5) and will perform an appropriate postfix operation given the following scenarios:
- data1 data2 + data3 * data4 -
- data1 data2 * data3 data1 - / data4 data5 * +
- data1data3 - data2^ data4+
Use the following values for each input:
data1 = 1;
data2 = 2;
data3 = 4
data4 = 5
data5 = 3
Ensure that your program has the required class and a test class.
Algorithm evaluatePostfix(postfix)
// Evaluates postfix expression.
valueStack = a new empty stack
while (postfix has characters left to parse)
{
nextCharacter = next nonblank character of postfix
switch (nextCharacter)
{
case variable:
valueStack.push(value of the variable nextCharacter)
break
case '+' : case '-' : case '*' : case '/' : case '^' :
operabdTwo = valueStack.pop()
operandOne = valueStack.pop()
result = the result if the operation in nextCharacter and its operands
operandOne and operandTwo
valueStack.push(result)
break
default : break //Ignore unexpected characters
}
}
return valueStack.peek()
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