可变参数处理，stdarg.h

#include <stdio.h>#include <stdarg.h>int print_ags(int begin,...){va_list ap;char* p;int n;va_start(ap,begin);p = va_arg(ap,char*);n = 0;while(p != NULL){n++;printf("arg %d: %s\n",n,p);p = va_arg(ap,char*);}va_end(ap);return n;}int main(vaoid){int n;n = print_ags(-1,"hello","world",NULL);printf("first, without NULL : %d\n",n);n = print_ags(-1,"China","beijing","Olympic",NULL);printf("second, without NULL : %d\n",n);return 0;}