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Decode the Coding Interview in C#: Real-World Examples

DIY: Basic Calculator II

Explore how to build a function that evaluates mathematical expressions given as strings, applying integer arithmetic and operator precedence. Learn to parse and compute results for expressions containing addition, subtraction, multiplication, and division without relying on built-in functions. This lesson equips you with techniques to handle basic calculator logic needed for real-world coding interviews.

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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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