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本文介绍了一个简单的网址解析器程序，该程序能够将输入的网址按协议、主机名、端口及路径进行拆分，并打印出各个部分的具体内容。适用于学习字符串处理和网址结构的基础知识。

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/* 字符串处理按格式分解网址水题 */ #define LOCAL #include<iostream> #include<cstdio> #include<cmath> #include<cstring> #include<cstdlib> #include<iomanip> #include<string> #include<algorithm> #include<ctime> #include<stack> #include<queue> #include<vector> using namespace std; int main() { #ifdef LOCAL freopen("input.txt","r",stdin); freopen("output.txt","w",stdout); #endif int ncase,cases=1,len,i;string str; cin>>ncase; while(ncase--) { cin>>str;len=str.size(); cout<<"URL #"<<cases++<<endl; cout<<"Protocol = "; switch(str[0]) { case 'f':cout<<"ftp"<<endl;;break; case 'h':cout<<"http"<<endl;break; case 'g':cout<<"gopher"<<endl;break; } i=0;while(str[i]!=':') i++; i+=3; cout<<"Host = "; while(i<len&&(str[i]!=':'&&str[i]!='/')) cout<<str[i++]; cout<<endl;cout<<"Port = "; if(i<len&&str[i]==':') { i++; while(i<len&&str[i]!='/') cout<<str[i++]; cout<<endl; } else cout<<"<default>"<<endl; cout<<"Path = "; if(i<len) { i++; while(i<len) cout<<str[i++]; cout<<endl; } else cout<<"<default>"<<endl; cout<<endl; } return 0; }