float: for numbers with single precision. var signedByte = (sbyte)42; var longVariable = (long)42; Conversions. ; decimal is instead more accurate than the two others, at the cost of performance. Fact is, They can derive many data types … Live Demo conversion from long double to decimal with at least DECIMAL_DIG digits and back to long double is the identity conversion: this is the decimal precision required to serialize/deserialize a long double (macro constant) You can convert any integral numeric type to any other integral numeric type. Double-precision is declared using the keyword double. It is a 64-bit IEEE 754 double precision floating point number for the value. Actual properties unspecified. It has 15 decimal digits of precision. Here is the syntax of double in C language, double variable_name; Here is an example of double in C language, Example. long double will have more precision while float will have a less precision. long double in C History. c documentation: Single precision and long double precision floating-point remainder: fmodf(), fmodl() double: It is used to store decimal numbers (numbers with floating point value) with double precision. Otherwise, you need to use a cast expression to perform an explicit conversion. Double. long double: for numbers with extended precision. -1.7e308 to +1.7e308 (15 decimal precision) long double 10-1.7e4932 to +1.7e4932 (19 decimal precision) Mainly, the primary data types are of three varieties, char int, and float. float and double types are meant to use when performance is more important than precision. 4) Type-generic macro: If the argument has type long double, sinl is called. To avoid the problem you facing you got to device your own data structure to represent precision you require. double: for numbers with double precision. The following table illustrates the technical attributes of various floating-point types in C. It is important to notice that this is only the minimal requirement for storage size defined by C. These ranges may vary from compiler to compiler. When using non-integer numeric types in C#, it is important to know the pros and cons of each specific type. Double is also a datatype which is used to represent the floating point numbers. The long double type was present in the original 1989 C standard, but support was improved by the 1999 revision of the C standard, or C99, which extended the standard library to include functions operating on long double such as sinl() and strtold().. Long double constants are floating-point constants suffixed with "L" or "l" (lower-case L), e.g., 0.333333333333333333L. Otherwise, sinf is called. The following table provide the details of standard floating-point types with storage sizes and value ranges and their precision − Type Storage size Value range Precision; float: 4 byte: 1.2E-38 to 3.4E+38: 6 decimal places: double: 8 byte: 2.3E-308 to 1.7E+308: 15 decimal places: long double: 10 … long double: Real floating-point type, usually mapped to an extended precision floating-point number format. If the destination type can store all values of the source type, the conversion is implicit. Regards, Bhuwan Chopra. If the argument is complex, then the macro invokes the corresponding complex function (csinf, csin, csinl). The IEEE standard also specifies half-precision (2-byte) and quadruple-precision (16-byte) formats, and a double-extended-precision (10-byte) format, which some C and C++ compilers implement as the long double data type. But how C programmer manages with only 3 data types. Actually with very double number there is a precision attached. 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