4.67 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
4.62 New language features of C99
4.64 // comments in C99 and C90
4.65 Compound literals in C99
4.66 Designated initializers in C99
4.68 Flexible array members in C99
4.69 __func__ predefined identifier in C99
4.70 inline functions in C99
4.71 long long data type in C99 and C90
4.72 Macros with a variable number of arguments in C99
4.73 Mixed declarations and statements in C99
4.74 New block scopes for selection and iteration statements in C99
4.75 _Pragma preprocessing operator in C99
4.76 Restricted pointers in C99
4.78 Complex numbers in C99
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