{"id":6679,"date":"2022-12-20T19:33:23","date_gmt":"2022-12-20T22:33:23","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/ecvt-man3\/"},"modified":"2022-12-20T19:33:23","modified_gmt":"2022-12-20T22:33:23","slug":"ecvt-man3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/ecvt-man3\/","title":{"rendered":"ECVT (man3)"},"content":{"rendered":"

ECVT<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
RETURN VALUE<\/a>
ATTRIBUTES<\/a>
CONFORMING TO<\/a>
NOTES<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

ecvt, fcvt \u2212 convert a floating-point number to a string<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/b><\/p>\n

char *ecvt(double<\/b> number<\/i>, int<\/b> ndigits<\/i>, int *<\/b>decpt<\/i>, int *<\/b>sign<\/i>);<\/b><\/p>\n

char *fcvt(double<\/b> number<\/i>, int<\/b> ndigits<\/i>, int *<\/b>decpt<\/i>, int *<\/b>sign<\/i>);<\/b><\/p>\n

Feature Test Macro Requirements for glibc (see feature_test_macros<\/b>(7)):<\/p>\n

ecvt<\/b>(), fcvt<\/b>():<\/p>\n

Since glibc 2.12:<\/p>\n

(_XOPEN_SOURCE\u00a0>=\u00a0500) ! (_POSIX_C_SOURCE\u00a0>=\u00a0200112L)
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc since 2.19: bodies\/ usr\/ _DEFAULT_SOURCE
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc versions <= 2.19: bodies\/ usr\/ _SVID_SOURCE<\/p>\n

Before glibc 2.12:<\/p>\n

_SVID_SOURCE || _XOPEN_SOURCE\u00a0>=\u00a0500<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

The ecvt<\/b>() function converts number<\/i> to a null-terminated string of ndigits<\/i> digits (where ndigits<\/i> is reduced to a system-specific limit determined by the precision of a double<\/i>), and returns a pointer to the string. The high-order digit is nonzero, unless number<\/i> is zero. The low order digit is rounded. The string itself does not contain a decimal point; however, the position of the decimal point relative to the start of the string is stored in *decpt<\/i>. A negative value for *decpt<\/i> means that the decimal point is to the left of the start of the string. If the sign of number<\/i> is negative, *sign<\/i> is set to a nonzero value, otherwise it is set to 0. If number<\/i> is zero, it is unspecified whether *decpt<\/i> is 0 or 1.<\/p>\n

The fcvt<\/b>() function is identical to ecvt<\/b>(), except that ndigits<\/i> specifies the number of digits after the decimal point.<\/p>\n

RETURN VALUE <\/a> <\/h2>\n

Both the ecvt<\/b>() and fcvt<\/b>() functions return a pointer to a static string containing the ASCII representation of number<\/i>. The static string is overwritten by each call to ecvt<\/b>() or fcvt<\/b>().<\/p>\n

ATTRIBUTES <\/a> <\/h2>\n

For an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n\n\n\n\n
<\/td>\n <\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n<\/table>\n

\"Image<\/p>\n

CONFORMING TO <\/a> <\/h2>\n

SVr2; marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specifications of ecvt<\/b>() and fcvt<\/b>(), recommending the use of sprintf<\/b>(3) instead (though snprintf<\/b>(3) may be preferable).<\/p>\n

NOTES <\/a> <\/h2>\n

Not all locales use a point as the radix character (“decimal point”).<\/p>\n

SEE ALSO <\/a> <\/h2>\n

ecvt_r<\/b>(3), gcvt<\/b>(3), qecvt<\/b>(3), setlocale<\/b>(3), sprintf<\/b>(3)<\/p>\n

COLOPHON <\/a> <\/h2>\n

This page is part of release 5.10 of the Linux man-pages<\/i> project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https:\/\/www.kernel.org\/doc\/man\u2212pages\/.<\/p>\n

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ecvt, fcvt \u2212 convert a floating-point number to a string <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2536],"tags":[2538,3058,3007],"class_list":["post-6679","post","type-post","status-publish","format-standard","hentry","category-3-llamadas-de-bibliotecas","tag-2538","tag-ecvt","tag-man3"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=6679"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6679\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=6679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=6679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=6679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}