Multi-operator Calculator in C/Java

Question

How to write a program which performs multiple operations
i.e which can calculate 2*2+1-3 ?
I want only logic not source code

Answer 1

Just saying that on code playground all operands need to be entered at once, separated by newlines.

Answer 2

A basic way:
1) Read the input
2) Divide the input in logical pieces (numbers and operators)
3) Use something for order all operations from their precedence and associativity (at example 2+3*5 is equals 3*5 = 15 + 2= 17) if do you want (usually is made by using a tree ds)
4) perfom the operations

Answer 3

Sonic not necessarily, if you create a lexical analyzer. you can calculate multiple mathematical expressions in one line with the use of stacks by changing them into a postfix notation.

KrOW explained a part of how this was done with the PEDMAS method to correctly structure the expressions.

this is usually how calculators and machines calculate multiple expressions.

here is a link on how it's done.
faculty.cs.niu.edu/~hutchins/csci241/eval.htm