Converts its argument to a null-terminated string of ASCII digits
and returns the address of the string. The string is stored in a
thread-specific location created by the DEC C
RTL.
Format
#include <stdlib.h>
char *fcvt (double value, int ndigits, int
*decpt, int *sign);
Arguments
- value
- An object of type double that is converted to a null-terminated
string of ASCII digits.
- ndigits
- The number of ASCII digits after the decimal point to be used in
the converted string.
- decpt
- The position of the decimal point relative to the first
character in the returned string. The returned string does not
contain the actual decimal point. A negative int value means that
the decimal point is decpt number of spaces to the left of
the returned digits (the spaces are filled with zeros). A 0 value
means that the decimal point is immediately to the left of the first
digit in the returned string.
- sign
- An integer value that indicates whether the value
argument is positive or negative. If value is negative,
the fcvt function places a nonzero value at the address specified
by sign. Otherwise, the functions assign 0 to the address
specified by sign.
Description
This function converts value to a null-terminated
string and returns a pointer to it. The resulting low-order digit is
rounded to the correct digit for outputting ndigits digits
in C F-format. The decpt argument is assigned the position
of the decimal point relative to the first character in the string.
In C F-format, ndigits is the number of digits desired
after the decimal point. Very large numbers produce a very long
string of digits before the decimal point, and ndigit of
digits after the decimal point. For large numbers, it is preferable
to use the gcvt or ecvt function so that E-format is used.
Repeated calls to the fcvt function overwrite any existing string.
The ecvt, fcvt, and gcvt functions represent the following special
values specified in the IEEE Standard for floating-point arithmetic:
| Value | Representation |
| Quiet NaN | NaNQ |
| Signalling NaN | NaNS |
| +Infinity | Infinity |
| -
Infinity | -Infinity |
The sign associated with each of these values is stored into the
sign argument. In IEEE floating-point representation,
a value of 0 (zero) can be positive or negative, as set by the
sign argument.
See also gcvt and ecvt in this section.
Return Value
| x | A pointer to the converted
string. |
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