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C and C++ Compiler Implementation Limits
D.3 Limits for floating-point numbers
This section describes the characteristics of floating-point numbers.
Table D-3 gives the characteristics, ranges, and limits for floating-point numbers. These
constants are defined in the float.h include file.
Table D-3 Floating-point limits
Constant Meaning Value
FLT_MAX Maximum value of float 3.40282347e+38F
FLT_MIN
Minimum normalized positive floating-point number value of
float
1.17549435e–38F
DBL_MAX Maximum value of double 1.79769313486231571e+308
DBL_MIN
Minimum normalized positive floating-point number value of
double
2.22507385850720138e–308
LDBL_MAX Maximum value of long double 1.79769313486231571e+308
LDBL_MIN
Minimum normalized positive floating-point number value of
long double
2.22507385850720138e–308
FLT_MAX_EXP Maximum value of base 2 exponent for type float 128
FLT_MIN_EXP Minimum value of base 2 exponent for type float –125
DBL_MAX_EXP Maximum value of base 2 exponent for type double 1024
DBL_MIN_EXP Minimum value of base 2 exponent for type double –1021
LDBL_MAX_EXP Maximum value of base 2 exponent for type long double 1024
LDBL_MIN_EXP Minimum value of base 2 exponent for type long double –1021
FLT_MAX_10_EXP Maximum value of base 10 exponent for type float 38
FLT_MIN_10_EXP Minimum value of base 10 exponent for type float –37
DBL_MAX_10_EXP Maximum value of base 10 exponent for type double 308
DBL_MIN_10_EXP Minimum value of base 10 exponent for type double –307
LDBL_MAX_10_EXP Maximum value of base 10 exponent for type long double 308
LDBL_MIN_10_EXP Minimum value of base 10 exponent for type long double –307
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