Can u explain how the time complexity is O(n) ?

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`Algorithm`

1. Read all the symbols from left to right of the postfix expression

2. If the reading symbol is $operand$ then push into the stack

3. If the reading symbol is $operator$, then perform two pop operations, do the arithmetic operation and again pushed the resultant into the stack

4. finally, perform a pop operation and print the popped value as the final result.

Code: https://ide.geeksforgeeks.org/k906uWSOei

Time complexity of evaluation algorithm is $O(n)$ where n is the number of characters in input expression.