How Can I Precisely Truncate Decimal Places Without Rounding in C#?

Truncate the number of decimal places exactly without rounding in C#

When processing numerical data, it is often necessary to truncate the number of decimal places. Truncation means removing the decimal point and following digits without rounding, which can be tricky.

For example, for the value 3.4679, it might be necessary to truncate it to 3.46 without introducing any rounding error. Multiple attempts using the Math.Round() method and different rounding modes all resulted in 3.47, which is unacceptable.

A more precise method involves a simple mathematical operation:

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

This calculation uses the Math.Truncate() function to remove all decimal places from a value, rounding it down to the nearest integer. Before multiplying by 100 we move the decimal point two places to the right. Dividing the truncated value by 100 returns it to its original proportions, preserving the truncated result without any rounding bias.

However, it is important to note that fractions like 0.1 cannot be represented exactly in the floating point system used in programming languages. Therefore, truncation may result in slight deviations from the expected results.

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