Real numbers are represented in C by the floating point types float, double, and long double.Just as the integer types can't represent all integers because they fit in a bounded number of bytes, so also the floating-point types can't represent all real numbers. For example, in Microsoft Visual C++ on x86 processors, long double is the same as double. The various integer types serve well for most software development projects. long double in C History. Format specifiers are also called as format string. Because of the storage method for the long double data type, more than one number can satisfy certain values that are available as macros.The representation of 128-bit long double numbers means that the following macros required by standard C in the values.h file do not have clear meaning: The double data type is the preferred floating point type for most scientific and engineering calculations. Double-precision is declared using the keyword double. Is it as L or LF . Representation of Long Double value. More formally, the internal representation of a floating point number can be characterized in terms of the following parameters: The sign is either -1 or 1. The long double type is guaranteed to have more bits than a double, but the exact number my vary from one hardware platform to another. In the case of GCC on x86 processors, it is 80 bits, though it may be stored as 96 bits or even 128 bits via compiler flags -- but you still only have 80 bits of precision. However, financial and mathematically oriented programs often make use of floating-point numbers. This is a constant for a particular representation. An item of type char occupies 1 byte of storage. 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. In C programming we need lots of format specifier to work with various data types. 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. In one of the exam answers and in some websites like indiabix it was L and in some stack overflow posts its LF. Format specifiers defines the type of data to be printed on standard output. The macros defined in this header, limits the values of various variable types like char, int and long. More detailed explanation in this topic is beyond the scope of this lesson. The exponent to which the base is raised. This section describes the internal or machine representation of the basic types supported by Watcom C/C++: char; short int; long int; int; float; double; char. The limits.h header determines various properties of the various variable types. These limits specify that a variable cannot store any value beyond these limits, for example an unsigned character can store up to a maximum value of 255. They correspond to the real types of FORTRAN and Pascal. Tag: c,printf,floating-point-precision. number of decimal digits that are guaranteed to be preserved in text -> float / double / long double-> text roundtrip without change due to rounding or overflow (see the C++ analog digits10 for detail) (macro constant) The most … Whether to print formatted output or to take formatted input we need format specifiers. I want to know how a value is represnted in long double. In C, such numbers are called type float, double, or long double. Types float, double, and long double. 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