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Decode the Coding Interview in Ruby: Real-World Examples

DIY: Basic Calculator II

Understand how to parse and evaluate mathematical expressions represented as strings using basic operators including addition, subtraction, multiplication, and division. This lesson helps you implement a calculator function without relying on built-in evaluation functions, preparing you for coding interview challenges like those used by Amazon.

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Problem statement

In this challenge, you are given a string, st, which contains an expression. You’ll evaluate this expression and return its value. Keep the following statements in mind while solving the problem:

  • The integer division should be rounded off to the nearest smallest integer.
  • The given expression is always valid, giving the intermediate result in the range of [[-2312^{31}
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