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marissa.sam/task2/temp/prompt.md

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+# Task
+I want you to write a simple calculator to evaluate arithmetic expressions.
+Solve your problem step by step with C++.
+Please consider the precedence of operators as well.
+
+## It includes two parts:
+
+- In the first part, you need to convert the input to a postfix expression.
+- In the second part, you need to evaluate the postfix expression that you get in the first
+  part.
+- You need to implement your algorithms using c++.
+- You also need to write comment inside the code explaining the following items.
+
+## Part 1: Convert an expression to postfix expression using stack in STL
+
+1. how to read and store the input?
+2. pseudo code of the algorithm
+3. data structures used in the algorithm
+4. time complexity
+5. space complexity
+6. how to store the postfix expression?
+
+## Part 2: Use stack of STL to evaluate a postfix expression
+
+1. how to read the postfix expression
+2. pseudo code of the algorithm
+3. data structures used in the algorithm
+4. time complexity
+5. space complexity
+6. how to output the final result?
+