Explanation of Solution
Tracing the expression evaluator program:
Expression: “3-4+5”
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 3
“
getTermValue
”
returns 3
“
getExpressionValue
”
consumes
-
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 4
“
getTermValue
”
returns 4
“
getExpressionValue
”
consumes +
“
getExpressionValue
” calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 5
“
getTermValue
”
returns 5
“
getExpressionValue
”
returns
“
4 (-1 + 5)
”
Expression: “3-(4+5)”
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 3
“
getTermValue
”
returns 3
“
getExpressionValue
”
consumes
-
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
consumes the ( input
“
getFactorValue
”
calls “getExpressionValue
”
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 4
“
getTermValue
”
returns 4
“
getExpressionValue
”
consumes
“
+
”
“
getExpressionValue
”
calls “getTermValue
”
“
getTermValue
”
calls “getFactorValue
”
“
getFactorValue
”
returns 5
“
getTermValue
” returns 5
“
getExpressionValue
”
returns 9
“
getFactorValue
”
consumes the ) input
“
getFactorValue
”
...
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