I'm reading input from a user which will consist of all digits. I will read these digits into an integer array and then intersparse them with operators such as + and -. My question is, after I do this, how do I evaluate this expression to an integer? I.E. I read in >>>>> "123456", then I manipulate the integer array to >>>>> "12+3456" Now, what do I do to evaluate that array so that it is the integer 3468?