C/C++下不定參數的函數的實現

#include <stdio.h><br />#include <string.h><br />#include <stdarg.h><br />void output_number(int size, ...)<br />{<br />va_list vlist;<br />int count = 0;<br /> int va;<br />va_start(vlist, size); </p><p>while( count < size)<br />{<br />va = va_arg(vlist, int);<br />printf("%d is: /t%d/n", count, va);<br />count++;<br />}<br />va_end(vlist);<br />} </p><p>void output_number(char* apstr, ...)<br />{<br />va_list vlist;<br />int count = 0;<br /> char* pstr = NULL;<br />va_start(vlist, apstr); </p><p>while(1)<br />{<br />pstr = va_arg(vlist, char*);<br />if ( strcmp( pstr, "/0") == 0 )<br />{<br />break;<br />}<br />printf("%d is: /t%s/n", count, pstr); </p><p>count++;<br />}<br />va_end(vlist);<br />} </p><p>void my_sprintf(char* pBuf, char* pFmt, ...)<br />{<br />va_list argp;<br />va_start(argp, pFmt);<br />vsprintf(pBuf, pFmt, argp);<br />va_end( argp );<br />}</p><p>int main(int argc, char* argv[])<br />{<br />char ch[100];<br />output_number(4, 11, 12, 13, 14);<br />output_number("TEST", "test", "a", "string", "!!!", "/0");<br />my_sprintf(ch, "Test my sprintf function: %s, %d/r/n", "sprintf", 10);<br />printf(ch);<br />return 0;<br />}