Overview of IEEE 754 1985 Standard Binary Floating
Point Arithmetic
---From: High Performance Computing, by Dowd and
Severance
| IEEE 754 |
FORTRAN |
C |
Bits |
Exponent |
Mantissa |
|
| Single |
REAL*4 |
float |
32 |
8 |
23 |
| Double |
REAL*8 |
double |
64 |
11 |
52 |
| Double Extended |
REAL*10 |
long double |
>=80 |
>=15 |
>=64 |
|
| IEEE 754 |
Min number |
Max number |
Base 10 accuracy |
|
| Single |
1.2 E -38 |
3.4 E +38 |
6-9 digits |
| Double |
2.2 E -308 |
1.8 E +308 |
15-17 digits |
Double
Extended |
3.4 E -4932 |
1.2 E 4932 |
18-21 digits |
|
Single Precision:
seeeeeeeemmmmmmmmmmmmmmmmmmmmmmm
Double Precision:
seeeeeeeeeeemmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm