C # The decimal precision in the data type is higher than that in the double type,

C # The decimal precision in the data type is higher than that in the double type,

Decimal 128bit size valid number: 28 ~ 29. Although the decimal type has a higher precision than the floating point type, it has a smaller range. Therefore, an overflow error may occur when double is converted to decimal. In addition, the decimal calculation speed is slightly slower.

 

Console. WriteLine (1.618031234567895 );

Output result: 1.61803123456789

The last number 5 is lost, which meets our expectation for double type precision.

To display a number with complete precision, you must declare the nominal value as a decimal type by appending an m (or M:

Console. WriteLine (1.618031234567895 m );

Output result: 1.618031234567895

M indicates decimal because this data type is often used in monetary calculation.