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Decode the Coding Interview in Scala: Real-World Examples

DIY: Basic Calculator II

Explore how to parse and evaluate mathematical expressions given as strings using basic arithmetic operators in Scala. Learn to handle operator precedence, integer division rounding, and implement the calculation logic without relying on built-in evaluation functions. This lesson equips you with problem-solving skills suitable for coding interview challenges.

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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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