5.68 Hexadecimal floating-point numbers in C99

C99 supports floating-point numbers that can be written in hexadecimal format.

For example:

float hex_floats(void)
{
    return 0x1.fp3; // 1 15/16 * 2^3
}

In hexadecimal format the exponent is a decimal number that indicates the power of two by which the significant part is multiplied. Therefore 0x1.fp3= 1.9375*8=1.55e1.

C99 also adds %a and %A format for printf().

Related concepts
5.63 New language features of C99
5.65 // comments in C99 and C90
5.66 Compound literals in C99
5.67 Designated initializers in C99
5.69 Flexible array members in C99
5.70 __func__ predefined identifier in C99
5.71 inline functions in C99
5.72 long long data type in C99 and C90
5.73 Macros with a variable number of arguments in C99
5.74 Mixed declarations and statements in C99
5.75 New block scopes for selection and iteration statements in C99
5.76 _Pragma preprocessing operator in C99
5.77 Restricted pointers in C99
5.79 Complex numbers in C99
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