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字典插入与查找.cpp
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字典插入与查找.cpp
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#include<iostream>
#include<map>
#include<cstring>
using namespace std;
int main(int argc, char const *argv[])
{
map<const char*,const char*> mp;
map<const char*,const char*>::iterator iter;
const char key[3][20]={"img","system","ip"};
const char value[3][20]={"d:/a.img","win7","193.68.6.3"};
//make_pair插入
for(int i=0;i<2;i++){
mp.insert(make_pair(key[i],value[i]));
}
//pair<const char*,const char*>插入
mp.insert(pair<const char*,const char*>(key[2],value[2]));
//数组插入方式
mp["addr"]="中国";
//迭代器取出元素
//循环取出元素
for(iter=mp.begin();iter!=mp.end();iter++){
cout<<iter->first<<"\t"<<iter->second<<endl;
}
char key1[20];
cout<<"请输入按key查找:";
cin.getline(key1,20);
//查找元素
for(iter=mp.begin();iter!=mp.end();iter++){
if(strcmp(iter->first,key1)==0){
cout<<iter->first<<"查找出来了!"<<"对应的值为:"<<iter->second<<endl;
}
}
//第一种删除方式
//find只能用于查找数组建立的形式!并且不支持输入用cin等
iter=mp.find("addr");
if(iter!=mp.end()){
cout<<iter->first<<"按照key查找出来了!"<<"对应的value为:"<<iter->second<<endl;
cout<<"开始删除元素!"<<endl;
mp.erase(iter);
// break;
}
//第二种方式删除
//按照key删除元素
char drop_key[20];
//按照value删除元素
char drop_value[20];
cout<<"请输入按key删除:";
cin.getline(drop_key,20);
cout<<"请输入按value删除:";
cin.getline(drop_value,20);
for(iter=mp.begin();iter!=mp.end();iter++){
if(strcmp(iter->first,drop_key)==0){
cout<<iter->first<<"按照key查找出来了!"<<"对应的value为:"<<iter->second<<endl;
cout<<"开始删除元素!"<<endl;
mp.erase(iter);
break;
}
if(strcmp(iter->second,drop_value)==0){
cout<<iter->second<<"value查找出来了!"<<"对应的key为:"<<iter->first<<endl;
cout<<"开始删除元素!"<<endl;
mp.erase(iter);
break;
}
}
cout<<"------删除元素以后--------\n";
//循环取出元素
for(iter=mp.begin();iter!=mp.end();iter++){
cout<<iter->first<<"\t"<<iter->second<<endl;
}
system("pause");
return 0;
}