What are the decimal types in C language?

C language decimal types include: float: single-precision floating point number, 7-digit precision, occupying 32-bit memory. double: double-precision floating-point number, 15-bit precision, occupying 64-bit memory. Select the type according to the precision requirements. Use float for low precision and double for high precision. Floating point numbers can be converted implicitly but with loss of precision, and very large or small numbers can be expressed in scientific notation.

Decimal types in C language

C language provides two decimal types, respectively:

• float: single-precision floating point number, occupying 32 bits of memory space and can represent approximately 7 significant digits.
• double: Double-precision floating point number, occupying 64-bit memory space and can represent approximately 15 significant digits.

Select a type

Which decimal type you choose depends on the required precision and memory consumption. For calculations requiring lower precision, the float type is sufficient. But for demanding calculations that require higher precision, it is recommended to use the double type.

Precision comparison

The following table compares the precision of the following values ​​when they are of different types:

##0.1230.1230000.1230000000000000012345.678912345.679##Memory consumption

Value	float	double
	##12345.67890625

The float type occupies 32-bit memory space, while the double type occupies 64-bit memory space. Therefore, when you need to process a large amount of decimal data and have limited memory, choosing the float type can save memory.

Note

Decimal types can be implicitly converted. For example, a float variable can be assigned to a double variable, but the opposite conversion will lose precision.

For very large or very small numbers, you can use scientific notation, for example, 1.23e-10 represents 1.23 * 10^(-10).

The above is the detailed content of What are the decimal types in C language?. For more information, please follow other related articles on the PHP Chinese website!