# Limits on Floating-Point Constants

Visual Studio 2005

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

2 2 2

FLT_ROUNDS_DBL_ROUNDS_LDBL_ROUNDS

1 (near) 1 (near) 1 (near)

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

END Microsoft Specific