填空题 以下程序的输出结果是 [9] 。
include＜iostream.h＞
include ＜string.h＞
void main 0
char s[50];
strcpy(&s[O], "No" );
strcpy(&s[1], "123" );
strcpy (&s[2], "23456" );
cout＜＜s;