How Can I Create a Custom Floating-Point Rounding Function in C ?

Custom Floating-Point Rounding Function

C does not include a built-in round() function for floating-point values. However, it is possible to create your own function using the floor() method:

double round(double d)
{
  return floor(d + 0.5);
}

This implementation provides half-up rounding, as specified in the requirements:

round(0.1) = 0
round(-0.1) = 0
round(-0.9) = -1

Implementation Notes

It's important to note that this implementation is not perfect and has some limitations:

• It does not handle rounding of values close to the midpoint (e.g., round(0.5) will return 0 instead of 1).
• It may not be exact for large or small values due to floating-point precision limitations.

Alternatives

For more robust rounding implementations, consider using external libraries or the newer std::round function introduced in C 11.

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