有以下程序： include ＜fstream＞ include ＜string＞ using namespace std; int main （) {char ch[]

有以下程序：

include ＜fstream＞

include ＜string＞

using namespace std;

int main ()

{

char ch[] = "The end";

ofstream outstr("d:\\put.txt", ios_base: :app);

for (int i = 0; i ＜ strlen(ch ); i++ )

outstr.put(ch[i]);

outstr.close();

return 0;

}

程序实现的功能是【 】。