By using a stack, evaluate the postfix expression a b – c +. Assume the following values for the identifiers: a = 7, b = 3, and c = –2. Show the status of the stack after each step.
What will be an ideal response?
```
Let aStack be the stack.
ch: a
aStack: 7
ch: b
aStack: 3 7
ch: –
operand2: 3
aStack: 7
operand1: 7
aStack:
result: 7 – 3 = 4
aStack: 4
ch: c
aStack: –2 4
ch: +
operand2: –2
aStack: 4
operand1: 4
aStack:
result: 4 + (–2) = 2
aStack: 2
The value of the expression is 2.
```
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