[C++知识库]C++ std::map使用

程序示例

#include <iostream>
#include <map>

using namespace std;

int main()
{
	map<char, int> mymap;	//使用map
	mymap.insert(pair<char, int>('a', 1));
	mymap.insert(pair<char, int>('b', 2));
	mymap.insert(pair<char, int>('c', 3));
	map<char, int>::iterator it;
	for (it = mymap.begin(); it != mymap.end(); it++) {
		cout << "key=" << it->first <<": " << it->second << endl;
	}
	cout << "============================" << endl;
	mymap.insert(pair<char, int>('c', 30));	//插入数据不能覆盖
	for (it = mymap.begin(); it != mymap.end(); it++) {
		cout << "key=" << it->first << it->second << endl;
	}
	cout << "============================" << endl;
	mymap['c'] =  30;	//插入数据可以覆盖
	mymap['d'] =  4;
	for (it = mymap.begin(); it != mymap.end(); it++) {
		cout << "key=" << it->first << it->second << endl;
	}

	return 0;
}