C++ 代码

#include <iostream>
using namespace std;

int main()
{
    string str;
    int count= 0;
    int len[2]={0,0};
    getline (cin,str);

    for(int i=0;i<str.size();i++)
    {
        int st=i,end=i;
        while(str[end] != ' ' && str[end] != '.')   end++;
        if((end - st) > count)  
        {
                count = end - st;
                len[0] = st;
                len[1] = end;
        }
        //cout << st <<" " << end <<" "<<count<<endl;
        i = end;
    }
    for(int i=len[0];i<len[1];i++)
            cout << str[i];

    return 0;
}