Decimal or Double in C#: Which Data Type Should You Choose for Precision?

The accuracy of the precision selection guidelines for the precision selection of DECIMAL and Double in the C#

C# provides two data types of DECImal and Double for storing values. Both are types of floating point, but there are key differences in accuracy and applicable scenarios.

The difference in accuracy

Double is a 64 -bit floating -point number type, which has a large value range, which can indicate very large and small numbers. However, due to its binary representation, Double sometimes loses accuracy. This is because the binary system cannot accurately represent the possible decimal value.

Decimal is a 128 -bit floating -point number type, which is specially designed for financial computing. It provides extremely high accuracy to ensure that the decimal value can be accurately stored and calculated.

When to use Decimal

Based on accuracy, the following situations are recommended to use DECIMAL:

Currency calculation:

DECIMAL is the first choice for financial calculations involving a large amount of funds (such as more than 100 million US dollars). It retains accuracy and ensures that the calculation is correct, eliminating the risk of settlement errors.

Cumulative computing:
• When numbers must be added or balanced, Decimal should be used. This includes any financial storage or calculation, scores, and other values ​​that may require manual verification. Numerical accuracy:
If the accuracy of the number is very important, for example, in accounting or scientific calculations, DECIMAL provides necessary accuracy.
• When to use double
• In the following circumstances, Double is more suitable:

speed:

For floating -point calculations, Double is faster than Decimal. Non -critical calculations:

When accuracy is not necessary, Double can be used in calculations in graphics, physics or other physics sciences.

Accuracy Restriction:

Double can represent very large and small numbers, which may be useful in some accuracy is not the main point of attention.
• Summary
• The difference between understanding the Decimal and Double in C# is essential for choosing appropriate data types that are calculated. Decimal is the best choice for accurate financial operations, accurate accumulation and numerical accuracy. Double is the first choice for scenes with speed, non -critical computing and accuracy requirements.

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