printf

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Langue: ja

Version: 2000-10-16 (openSuse - 09/10/07)

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Section: 3 (Bibliothèques de fonctions)

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printf, fprintf, sprintf, snprintf, vprintf, vfprintf, vsprintf, vsnprintf - »ØÄꤵ¤ì¤¿½ñ¼°¤ËÊÑ´¹¤·¤Æ½ÐÎϤò¹Ô¤¦

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#include <stdio.h>

int printf(const char *format, ...);
int fprintf(FILE *stream, const char *format, ...);
int sprintf(char *str, const char *format, ...);
int snprintf(char *str, size_t size, const char *format, ...);

#include <stdarg.h>

int vprintf(const char *format, va_list ap);
int vfprintf(FILE *stream, const char *format, va_list ap);
int vsprintf(char *str, const char *format, va_list ap);
int vsnprintf(char *str, size_t size, const char *format, va_list ap);

ÀâÌÀ

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#include <math.h>

#include <stdio.h>

fprintf(stdout, "pi = %.5f\n", 4 * atan(1.0));

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#include <stdio.h>

fprintf(stdout, "%s, %s %d, %.2d:%.2d\n",

        weekday, month, day, hour, min);

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#include <stdio.h>

fprintf(stdout, format,

        weekday, month, day, hour, min);



format ¤Ï¥í¥±¡¼¥ë¤Ë°Í¸¤·¤Æ¤ª¤ê¡¢°ú¤­¿ô¤Î½çÈÖ¤òÊѤ¨¤ë¤³¤È¤â¤Ç¤­¤ë¡£ format ¤¬


"%1$s, %3$d. %2$s, %4$d:%5$.2d\n"

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½½Ê¬¤ËÂ礭¤Êʸ»úÎóÎΰè¤ò³ÎÊݤ·¤Æ¡¢¤½¤³¤Ë¥á¥Ã¥»¡¼¥¸¤ò³ÊǼ¤¹¤ë¤Ë¤Ï (glibc 2.0 ¤È glibc 2.1 ¤ÎξÊý¤ÇÀµ¤·¤¯Æ°ºî¤¹¤ë¥³¡¼¥É):




#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

char *

make_message(const char *fmt, ...)

{

    /* Guess we need no more than 100 bytes. */

    int n, size = 100;

    char *p, *np;

    va_list ap;



    if ((p = malloc(size)) == NULL)

        return NULL;



    while (1) {

        /* Try to print in the allocated space. */

        va_start(ap, fmt);

        n = vsnprintf(p, size, fmt, ap);

        va_end(ap);

        /* If that worked, return the string. */

        if (n > -1 && n < size)

            return p;

        /* Else try again with more space. */

        if (n > -1)    /* glibc 2.1 */

            size = n+1; /* precisely what is needed */

        else           /* glibc 2.0 */

            size *= 2;  /* twice the old size */

        if ((np = realloc (p, size)) == NULL) {

            free(p);

            return NULL;

        } else {

            p = np;

        }

    }

}

´ØÏ¢¹àÌÜ

printf(1), asprintf(3), dprintf(3), scanf(3), setlocale(3), wcrtomb(3), wprintf(3), locale(5)