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题意

字符串分离

思路

用sscanf实现分离，事实上也可以用string数组老老实实挑出分隔符，逻辑我处理不好，换成sscanf了。
把字符串先以://分成两部分，对后面分别进行处理。
我之前直接用一句sscanf(s,"%[a-zA-Z]://%[a-z,.,-]:%[0-9]/%[a-z,.,-]",protocol,host,port,path);到了第三例的时候崩了，同学提醒这样写表示里面的符号必需，所以是会出错的。以后注意。
关于sccanf的介绍

代码

#include<iostream>
#include<stdio.h>
#include<string>
#include<string.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    char s[61]={'\0'};
    for(int i=1;i<=n;i++){
        cin>>s;
        char protocol[60]={'\0'},
        host[60]={'\0'},
        port[60]={'\0'},
        path[60]={'\0'},
        temp[60]={'\0'},
        temp1[60]={'\0'};
        cout<<"URL #"<<i<<endl;
        sscanf(s,"%[a-zA-Z]://%s",protocol,temp);
        sscanf(temp,"%[^/]/%s",temp1,path);
        sscanf(temp1,"%[^:]:%s",host,port);
        if(!strcmp(protocol,""))
            cout<<"Protocol = <default>"<<endl;
        else
            cout<<"Protocol = "<<protocol<<endl;
        if(!strcmp(host,""))
            cout<<"Host = <default>"<<endl;
        else
            cout<<"Host = "<<host<<endl;
        if(!strcmp(port,""))
            cout<<"Port = <default>"<<endl;
        else
            cout<<"Port = "<<port<<endl;
        if(!strcmp(path,""))
            cout<<"Path = <default>"<<endl;
        else
            cout<<"Path = "<<path<<endl;
        cout<<endl;
    }
    return 0;
}