The programmer will write the ExpressionSolverRunner that will use the ExpressionSolver class to solve an integer expression provided by the ExpressionSolver textfile. An expression will a String and it will be comprised of number and the mathematical operators +, *, /, and -. The % operation will not be a part of this program. In order to read an expression, the user must read the expression from left to right performing the multiplication and division operators before attempting the subtraction arguments. The programmer should be careful to follow the order of operations, or they will not get the correct answer. The calculation is integer mathematics, so there will be no rounding but just truncation. The programmer should take particular care when a multiplication and a division or next to each other and make sure to do the operations from left to right. There will be no parenthesis in the expression.
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