ecvt(3)
NAME
ecvt, fcvt, gcvt − output conversion
SYNTAX
char *ecvt(value, ndigit, decpt, sign)
double value;
int ndigit, *decpt, *sign;
char *fcvt(value, ndigit, decpt, sign)
double value;
int ndigit, *decpt, *sign;
char *gcvt(value, ndigit, buf)
double value;
int ndigit;
char *buf;
DESCRIPTION
The ecvt subroutine converts the value to a null-terminated string of ndigit ASCII digits and returns a pointer thereto. The position of the decimal point relative to the beginning of the string is stored indirectly through decpt (negative means to the left of the returned digits). If the sign of the result is negative, the word pointed to by sign is non-zero. Otherwise it is zero. The low-order digit is rounded.
The fcvt subroutine is similar to ecvt, except that the correct digit has been rounded for Fortran F-format output of the number of digits specified by ndigit.
The gcvt converts the value to a null-terminated ASCII string in buf and returns a pointer to buf. It attempts to produce ndigit significant digits either in Fortran F format, if possible, or E format (ready for printing). A minus sign, if there is one, or a decimal point will be included as part of the returned string. Trailing zeros may be suppressed.
RESTRICTIONS
The return values point to static data whose content is overwritten by each call.