What is the algorithm for simple calculator?

What is the algorithm for simple calculator?
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A simple calculator works strictly left to right:get a number as the result of the last operation (if there is no number make it zero)make the result of the last operation the current numberget the next operatorif there is no next operator or it is equals (=) go to step 8get the next numberdo the operator on the current number and the next numbergo to step 2print the result of the last operatorstopYou need to: decide what to do if two operators are found together without an intervening number;decide how to detect a unary minus (ie when a '-' is found, is it a binary "number - number", or a unary "negate following number"how to handle the numbers - work with integers, fixed point or floating point, etc.decode the operator and do the relevant operation on the stored numbers.-----------------------------------A reverse polish calculator is actually much easier to code (than a simple calculator), but allows the user to specify precedence of operations (like a scientific calculator) or to use it as a simple calculator (left-to-right):Initialise the stackget an objectif no more objects go to step 12if the object is a number go to step 9if the are not at least 2 numbers on the stack errordo the operation on under and top (eg under ÷ top)remove the top two numbers and push the result on the stackrepeat from step 2if stack full errorpush the number on the stackrepeat form step 2If stack empty push 0 onto the stackprint top number on stackclear the stackstopA simple calculator would evaluate: "1 + 3 x 2" as "(1 + 3) x 2" = 4 x 2 = 8The reverse polish calculator would have the same calculation entered as "1 3 + 2 x"
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