How Can I Accurately Truncate, Not Round, Floating-Point Numbers to Two Decimal Places?

Precisely Truncating Floating-Point Numbers to Two Decimal Places

Directly truncating floating-point numbers to a specific decimal place without rounding is tricky due to how floating-point numbers are stored. Standard rounding methods often introduce unwanted rounding errors.

A reliable method for accurate truncation involves these steps:

<code class="language-csharp">value = Math.Truncate(100 * value) / 100;</code>

This code multiplies the floating-point number by 100, uses Math.Truncate to remove the fractional part (effectively truncating), and then divides the result by 100 to restore the original scale. For 3.4679, this correctly yields 3.46.

It's crucial to remember that floating-point numbers don't always have perfect binary representations. Therefore, minor discrepancies might occur between the truncated value and the theoretically expected result.

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