有如下的程序: include <iostream> include <fstream> using namespace std; int main() { ofstream outf('D://temp.txt',ios_base::trunc) ; outf<<'World Wide Web'; outf.close(); ifstream inf('D://temp.txt'); char s[20]; inf>>s; inf.close(); cout<<s; return 0; } 执行后的输出结果是【 】。