Visual Fortran includes several intrinsic functions that return details about the numeric representation. These are listed in the following table and described fully in the Language Reference.
Functions that Return Numeric Parameters
| Name | Description | Argument/Function Type |
|---|---|---|
| DIGITS | DIGITS(x). Returns number of significant digits for data of the same type as x. | x: Integer or Real
result: INTEGER(4) |
| EPSILON | EPSILON(x). Returns the smallest positive number that when added to one produces a number greater than one for data of the same type as x. | x: Real
result: same type as x |
| EXPONENT | EXPONENT(x). Returns the exponent part of the representation of x. | x: Real
result: INTEGER(4) |
| FRACTION | FRACTION(x). Returns the fractional part (significand) of the representation of x. | x: Real
result: same type as x |
| HUGE | HUGE(x). Returns largest number that can be represented by data of type x. | x: Integer or Real
result: same type as x |
| MAXEXPONENT | MAXEXPONENT(x). Returns the largest positive decimal exponent for data of the same type as x. | x: Real
result: INTEGER(4) |
| MINEXPONENT | MINEXPONENT(x). Returns the largest negative decimal exponent for data of the same type as x. | x: Real
result: INTEGER(4) |
| NEAREST | NEAREST(x, s). Returns the nearest different machine representable number to x in the direction of the sign of s. | x: Real
s: Real and not zero result: same type as x |
| PRECISION | PRECISION(x). Returns the number of significant digits for data of the same type as x. | x: Real or Complex
result: INTEGER(4) |
| RADIX | RADIX(x). Returns the base for data of the same type as x. | x: Integer or Real
result: INTEGER(4) |
| RANGE | RANGE(x). Returns the decimal exponent range for data of the same type as x. | x: Integer, Real or Complex
result: INTEGER(4) |
| RRSPACING | RRSPACING(x). Returns the reciprocal of the relative spacing of numbers near x. | x: Real
result: same type as x |
| SCALE | SCALE(x, i). Multiplies x by 2 raised to the power of i. | x: Real
i: Integer result: same type as x |
| SET_EXPONENT | SET_EXPONENT(x,i). Returns a number whose fractional part is x and whose exponential part is i. | x: Real
i: Integer result: same type as x |
| SPACING | SPACING(x). Returns the absolute spacing of numbers near x. | x: Real
result: same type as x |
| TINY | TINY(x). Returns smallest positive number that can be represented by data of type x. | x: Real
result: same type as x |