| 1 | .TH ECVT 3 |
| 2 | .SH NAME |
| 3 | ecvt, fcvt, gcvt \- output conversion |
| 4 | .SH SYNOPSIS |
| 5 | .B char *ecvt(value, ndigit, decpt, sign) |
| 6 | .br |
| 7 | .B double value; |
| 8 | .br |
| 9 | .B int ndigit, *decpt, *sign; |
| 10 | .PP |
| 11 | .B char *fcvt(value, ndigit, decpt, sign) |
| 12 | .br |
| 13 | .B double value; |
| 14 | .br |
| 15 | .B int ndigit, *decpt, *sign; |
| 16 | .PP |
| 17 | .B char *gcvt(value, ndigit, buf) |
| 18 | .br |
| 19 | .B double value; |
| 20 | .br |
| 21 | .B char *buf; |
| 22 | .SH DESCRIPTION |
| 23 | .I Ecvt |
| 24 | converts the |
| 25 | .I value |
| 26 | to a null-terminated string of |
| 27 | .I ndigit |
| 28 | ASCII digits |
| 29 | and returns a pointer thereto. |
| 30 | The position of the decimal point relative to the |
| 31 | beginning of the string is stored indirectly |
| 32 | through |
| 33 | .IR decpt "" |
| 34 | (negative means to the left of the |
| 35 | returned digits). |
| 36 | If the sign of the result is negative, |
| 37 | the word pointed to by |
| 38 | .IR sign "" |
| 39 | is non-zero, otherwise |
| 40 | it is zero. |
| 41 | The low-order digit is rounded. |
| 42 | .PP |
| 43 | .IR Fcvt " is identical to " "ecvt\fR, except that the correct digit" |
| 44 | has been rounded for Fortran F-format output of the number |
| 45 | of digits specified by |
| 46 | .IR \(*_ndigits . |
| 47 | .PP |
| 48 | .I Gcvt |
| 49 | converts the |
| 50 | .I value |
| 51 | to a null-terminated ASCII string in |
| 52 | .I buf |
| 53 | and returns a pointer to |
| 54 | .I buf. |
| 55 | It attempts to produce |
| 56 | .I ndigit |
| 57 | significant digits in Fortran F format if |
| 58 | possible, otherwise E format, ready for |
| 59 | printing. |
| 60 | Trailing zeros may be suppressed. |
| 61 | .SH "SEE ALSO" |
| 62 | printf(3) |
| 63 | .SH BUGS |
| 64 | The return values point to static data |
| 65 | whose content is overwritten by each call. |