Dev Nest Guide
cppbeginner10 minutes

Fix the Bug in a Simple Temperature Converter

Debug a basic C++ function that is supposed to convert temperatures from Celsius to Fahrenheit but currently produces incorrect results.

Challenge prompt

You are given a function meant to convert temperature values from Celsius to Fahrenheit using the formula F = (C * 9/5) + 32. However, the current implementation returns incorrect values. Identify and fix the bug so the function returns the correct Fahrenheit temperature for any Celsius input.

Guidance

  • • Review the arithmetic operations and their order in the formula.
  • • Watch out for integer division pitfalls in C++.
  • • Test the function with common values like 0°C (should return 32°F) and 100°C (should return 212°F).

Hints

  • • Check if the division 9/5 is computed as integer division which may cause truncation.
  • • Make sure multiplication and addition are done in the right order without losing precision.

Starter code

double celsiusToFahrenheit(int celsius) {
    return celsius * 9 / 5 + 32;
}

Expected output

celsiusToFahrenheit(0) should return 32 celsiusToFahrenheit(100) should return 212

Core concepts

arithmetic operationsoperator precedencedata types and integer division

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