### Evaluation of Postfix Expression

##### Algorithm:

- Create stack to hold operands and result
- Iterate String from start to end
- If currentCharacter is digit then,
`stack.push(currentCharacter)`

- Else
`int operand1 = stack.pop`

`int operand2 = stack.pop`

`int result = operand1 currentCharacter operand2`

`stack.push(result)`

- If currentCharacter is digit then,
`return stack.pop`

Latest Source Code:

Github: PostfixExpressionEvaluation.java

**Output:**

2 3 1 * + 9 - = -4