在C++中在C++中for循环可以使用类似java的简化的for循环,可以用于遍历数组,容器,string以及由begin和end函数定义的序列(即有Iterator)

#include <iostream>
#include <map>
#include <string>
using namespace std;

int main()
{	
	map<string, int> ms;
	ms.insert(make_pair("a", 1));
	ms.insert(make_pair("b", 2));
	ms.insert(make_pair("c", 3));
	ms.insert(make_pair("d", 4));
	
	for (auto itr: ms)
		cout << itr.first << ":" << itr.second << endl;
		
	int a[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
	for (auto itr: a)
		cout << itr << endl;
		
	char str[10] = "Hello";
	for (auto itr : str)
		cout << itr;
	cout << endl;
	
	string _str = "Hello";
	for (auto itr : _str)
		cout << itr;
	cout << endl; 
	
	return 0;
}