# Floating Limits

Visual Studio 2010

Microsoft Specific

The following table lists the limits on the values of floating-point constants. These limits are also defined in the standard header file FLOAT.H.

Limits on Floating-Point Constants

Constant

Meaning

Value

FLT_DIG DBL_DIG LDBL_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_EPSILON DBL_EPSILON LDBL_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_DIG DBL_MANT_DIG LDBL_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_MAX DBL_MAX LDBL_MAX

Maximum representable floating-point number.

3.402823466e+38F 1.7976931348623158e+308 1.7976931348623158e+308

FLT_MAX_10_EXP DBL_MAX_10_EXP LDBL_MAX_10_EXP

Maximum integer such that 10 raised to that number is a representable floating-point number.

38 308 308

FLT_MAX_EXP DBL_MAX_EXP LDBL_MAX_EXP

Maximum integer such that FLT_RADIX raised to that number is a representable floating- point number.

128 1024 1024

FLT_MIN DBL_MIN LDBL_MIN

Minimum positive value.

1.175494351e–38F 2.2250738585072014e–308 2.2250738585072014e–308

FLT_MIN_10_EXP DBL_MIN_10_EXP LDBL_MIN_10_EXP

Minimum negative integer such that 10 raised to that number is a representable floating- point number.

–37

–307

–307

FLT_MIN_EXP DBL_MIN_EXP LDBL_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

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

The information in the table may differ in future versions of the product.