单选题有以下程序
#include
char fun(char *c)
{if(*c<='Z'&&*c>='A')*c-='A'-'a';return *c;
}
main()
{char s[81],*p=s;gets(s);while(*p){*p=fun(p);putchar(*p);p++;}printf();
}
若运行时从键盘上输入OPEN THE DOOR<回车>,程序的输出结果是( )。A
OPEN THE DOORB
OPEN tHE dOORC
open the doorD
Ope