#include<iostream>
#include<cassert>
using namespace std;

void dename(const string& fullname,string& firstname,
                  string& middlename,string& lastname);
                  
int main()
{
    cout<<"enter a fullname:";
    string fullname;
    getline(cin,fullname);
    string fname,mname,lname;
    dename(fullname,fname,mname,lname);
   
    cout<<fname<<endl;
    cout<<mname<<endl;
    cout<<lname<<endl;
}

#include<cassert>
using namespace std;

void dename(const string& fullname,string& firstname,
                  string& middlename,string& lastname);
{
     int firstblankindex=fullname.find(' ',0);
     assert(firstblankindex!=string::npos);
     firstname=fullname.substr(0,firstblankindex);
     
     int secondblankindex=fullname.find(' ',firstblankindex+1);
     assert(secondblankindex!=string::npos);
     middlename=fullname.substr(firstblankindex+1,
                          secondblankindex-firstblankindex+1);
     
     int fullnamesize=fullname.size();
     lastname=fullname.substr(secondblankindex+1,
                          fullnamesize-secondblankindex-1);

这是书上的一个例题,但不知道为什么总是过不了编译, 是不是编译器有问题呢??

最后少大括号是我复制时陋了~
我去掉了25行的分号通过了,
但运行时,我输入后再ENTET却消失了~没结果啊