STL-map测试
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2024-02-17 15:21:46
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#include <map>
#include <iostream>
#include <string>
using namespace std;
int main()
{
map<string, int> simap; //以string为键值,以int为实值
simap[string("jjhou")] = 1; //第一对内容是{"jjhou", 1}
simap[string("jerry")] = 2; //第二对内容是{"jerry", 2}
simap[string("jason")] = 3; //第二对内容是{"jason", 3}
simap[string("jimmy")] = 4; //第二对内容是{"jimmy", 4}
pair<string, int> value(string("david"), 5);//pair将两个参数组合在一起
simap.insert(value);
map<string, int>::iterator simap_iter = simap.begin(); //david 5
for( ; simap_iter != simap.end(); ++simap_iter) //jason 3
cout << simap_iter->first << ' ' << simap_iter->second << endl;//jerry 2
//map根据key按字母自动排序 //jimmy 4
int number = simap[string("jjhou")]; //jjhou 1
cout << number << endl; //获取jjhou键值对应的实值:1
map<string, int>::iterator itel;
itel = simap.find(string("mchen"));
if(itel == simap.end())
cout << "mchen not found" << endl; //mchen not found
itel = simap.find(string("jerry"));
if(itel == simap.end())
cout << "jerry found" << endl; //jerry found
itel->second = 9; //可以通过map迭代器修改value,不是key
int number2 = simap[string("jerry")];
cout << number2 << endl; //输出9
}