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FORTRAN 77 Language Reference

Real, Double, and Quadruple Precision

Real, double precision, and quadruple precision number data elements are represented according to the IEEE standard by the following form, where f is the bits in the fraction. Quad is SPARC only.

(-1)sign * 2exponent-bias *1.f

Table C-1 Floating-point Representation

 

Single 

Double 

Quadruple  

Sign 

Bit 31 

Bit 63 

Bit 127  

Exponent 

Bits 30-23 Bias 127 

Bits 62-52 Bias 1023 

Bits 126-112 Bias 16583 

Fraction 

Bits 22-0 

Bits 51-0 

Bits 111-0  

Range approx. 

3.402823e+38 1.175494e-38 

1.797693e+308 2.225074e-308 

3.362E-4932 1.20E+4932