Limits on Floating-Point Constants 

Microsoft Specific

Limits on the values of floating-point constants are given in the following table. The header file FLOAT.H contains this information.

Limits on Floating-Point Constants

Constant	Meaning	Value
FLT_DIGDBL_DIGLDBL_DIG	Number of digits, q, such that a floating-point number with q decimal digits can be rounded into a floating-point representation and back without loss of precision.	6 15 15
FLT_EPSILONDBL_EPSILONLDBL_EPSILON	Smallest positive number x, such that x + 1.0 is not equal to 1.0	1.192092896e–07F 2.2204460492503131e–016 2.2204460492503131e–016
FLT_GUARD		0
FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG	Number of digits in the radix specified by FLT_RADIX in the floating-point significand. The radix is 2; hence these values specify bits.	24 53 53
FLT_MAXDBL_MAXLDBL_MAX	Maximum representable floating-point number.	3.402823466e+38F 1.7976931348623158e+308 1.7976931348623158e+308
FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP	Maximum integer such that 10 raised to that number is a representable floating-point number.	38 308 308
FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP	Maximum integer such that FLT_RADIX raised to that number is a representable floating-point number.	128 1024 1024
FLT_MINDBL_MINLDBL_MIN	Minimum positive value.	1.175494351e–38F 2.2250738585072014e–308 2.2250738585072014e–308
FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP	Minimum negative integer such that 10 raised to that number is a representable floating-point number.	–37 –307 –307
FLT_MIN_EXPDBL_MIN_EXPLDBL_MIN_EXP	Minimum negative integer such that FLT_RADIX raised to that number is a representable floating-point number.	–125 –1021 –1021
FLT_NORMALIZE		0
FLT_RADIX_DBL_RADIX_LDBL_RADIX	Radix of exponent representation.	2 2 2
FLT_ROUNDS_DBL_ROUNDS_LDBL_ROUNDS	Rounding mode for floating-point addition.	1 (near) 1 (near) 1 (near)

Note that the information in the above table may differ in future implementations.

END Microsoft Specific

See Also

Reference

C Floating-Point Constants