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void va_start( va_list arg_ptr, prev_param );
type va_arg( va_list arg_ptr, type );
void va_end( va_list arg_ptr );
va_list:ÓÃÀ´±£´æºêva_start¡¢va_argºÍva_endËùÐèÐÅÏ¢µÄÒ»ÖÖÀàÐÍ¡£ÎªÁË·ÃÎʱ䳤²ÎÊýÁбíÖеIJÎÊý£¬±ØÐëÉùÃ÷
             va_listÀàÐ͵ÄÒ»¸ö¶ÔÏó       ¶¨Ò壺 typedef char *  va_list;
va_start:·ÃÎʱ䳤²ÎÊýÁбíÖеIJÎÊý֮ǰʹÓõĺ꣬Ëü³õʼ»¯ÓÃva_listÉùÃ÷µÄ¶ÔÏ󣬳õʼ»¯½á¹û¹©ºêva_argºÍ
               va_endʹÓã»
va_arg: Õ¹¿ª³ÉÒ»¸ö±í´ïʽµÄºê£¬¸Ã±í´ïʽ¾ßÓб䳤²ÎÊýÁбíÖÐÏÂÒ»¸ö²ÎÊýµÄÖµºÍÀàÐÍ¡£Ã¿´Îµ÷ÓÃva_arg¶¼»áÐÞ¸Ä
              ÓÃva_listÉùÃ÷µÄ¶ÔÏ󣬴ӶøÊ¹¸Ã¶ÔÏóÖ¸Ïò²ÎÊýÁбíÖеÄÏÂÒ»¸ö²ÎÊý£»
va_end:¸Ãºêʹ³ÌÐòÄܹ»´Ó±ä³¤²ÎÊýÁбíÓúêva_startÒýÓõĺ¯ÊýÖÐÕý³£·µ»Ø¡£
vaÔÚÕâÀïÊÇvariable-argument(¿É±ä²ÎÊý)µÄÒâ˼.
ÕâЩºê¶¨ÒåÔÚstdarg.hÖÐ,ËùÒÔÓõ½¿É±ä²ÎÊýµÄ³ÌÐòÓ¦¸Ã°üº¬Õâ¸öÍ·Îļþ.ÏÂÃæÎÒÃÇдһ¸ö¼òµ¥µÄ¿É±ä²ÎÊýµÄº¯Êý,¸Äº¯ÊýÖÁÉÙÓÐÒ»¸öÕûÊý²ÎÊý,µÚ¶þ¸ö²ÎÊýÒ²ÊÇÕûÊý,ÊÇ¿ÉÑ¡µÄ.º¯ÊýÖ»ÊÇ´òÓ¡ÕâÁ½¸ö²ÎÊýµÄÖµ.
#include <stdio.h>;
#include <string.h>;
#include <stdarg.h>;
/* ANSI±ê×¼ÐÎʽµÄÉùÃ÷·½Ê½£¬À¨ºÅÄÚµÄÊ¡ÂԺűíʾ¿ÉÑ¡²ÎÊý */
int demo(char *msg, ... )
{
va_list argp; /* ¶¨Òå±£´æº¯Êý²ÎÊýµÄ½á¹¹ */
int argno = 0; /* ¼Í¼²ÎÊý¸öÊý */
char *para; /* ´æ·ÅÈ¡³öµÄ×Ö·û´®²ÎÊý */

/* argpÖ¸Ïò´«ÈëµÄµÚÒ»¸ö¿ÉÑ¡²ÎÊý£¬ msgÊÇ×îºóÒ»¸öÈ·¶¨µÄ²ÎÊý */
va_start( argp, msg );

while (1)
{
para = va_arg( argp, char *); /* È¡³öµ±Ç°µÄ²ÎÊý£¬ÀàÐÍΪchar *. */
if ( strcmp( para, "\0") == 0 )
/* ²ÉÓÿմ®Ö¸Ê¾²ÎÊýÊäÈë½áÊø */
break;
printf("Parameter #%d is: %s\n", argno, para);
argno++;
}
va_end( argp ); /* ½


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C/C++——С±à̸CÓïÑÔº¯ÊýÄÇЩÊÂ(8)

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1.       gcvtº¯Êý
 
gcvtº¯ÊýµÄ¹¦ÄÜÊǰѸ¡µãÊýת»»³É×Ö·û´®£¬ÆäÓ÷¨ÊÇ£ºchar *gcvt(double value, int ndigit, char *buf);³ÌÐò ......

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C/C++——С±à̸CÓïÑÔº¯ÊýÄÇЩÊÂ(16)

 C³ÌÐòÊÇÓÉÒ»×é»òÊDZäÁ¿»òÊǺ¯ÊýµÄÍⲿ¶ÔÏó×é³ÉµÄ¡£ º¯ÊýÊÇÒ»¸ö×ÔÎÒ°üº¬µÄÍê³ÉÒ»¶¨Ïà¹Ø¹¦ÄܵÄÖ´ÐдúÂë¶Î¡£ÏÂÃæÐ¡±àºÍ´ó¼Ò·ÖÏíÏÂCÓïÑÔÖеĺ¯Êý¡£
1.      qsortº¯Êý
qsortº¯ÊýµÄ¹¦ÄÜÊÇʹÓÿìËÙÅÅÐòÀý³Ì½øÐÐÅÅÐò£¬ÆäÓ÷¨Îª£ºvoid qsort(void *base, int nelem, int width, int (*fcmp)());³Ì ......

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#define NULL 0
#define LEN 10
#define OK printf("\n´Ë×éÊý¾ÝºÏ¸ñ¡£\n")
#define NO printf("\n´Ë×éÊý¾Ý²»ºÏ¸ñ£¡\n")
#define CN printf("\n%30c ΰ³É¹¤×÷ÊÒÈÙÓþ³öÆ· %c\n",17,16)
#include "stdlib.h"
#include "math.h"
static float min,ave;       
float *zwfloat(void ......
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