如果执行下面 C++ 代码后，输出的结果是"gesp ccf org cn"，则横线上应填入哪个代码？（ ）
#include <iostream>
using namespace std;
int main() {
string str = "gesp.ccf.org.cn";
string delimiter = ".";
string result="";
string token;
size_t found = str.find(delimiter);
while (found != string::npos) {
token = str.substr(0, found);
result += token;
result += " ";
____________ // 在此处填入代码
found = str.find(delimiter);
}
result += str;
result += " ";
//最后一部分
cout << result << endl;
return 0;
}
- A.
str = str.substr(found + delimiter.length(), str.length() - 1); - B.
str = str.substr(found, str.length()); - C.
str = str.substr(found, str.length() -1); - D. 以上都不对