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一点睛
map数据的遍历，也有3种方法
* 应用前向迭代器方式
* 应用后向迭代器方式
* 应用数组方式
二map反向迭代器的使用实战
1代码
#include <map> #include <string> #include <iostream> using namespace std; int
main(){ map<int,string> mapStudent; mapStudent[1] = "student_one";
mapStudent[2] = "student_two"; mapStudent[3] = "student_three"; map<int,
string>::reverse_iterator iter; for(iter = mapStudent.rbegin(); iter !=
mapStudent.rend(); iter++){ cout<<iter->first<<" "<<iter->second<<endl; }
return 0; }
2运行
[root@localhost charpter03]# g++ 0323.cpp -o 0323 [root@localhost charpter03]#
./0323 3 student_three 2 student_two 1 student_one
3说明
iter是一个反向迭代器reverse_iterator，它需要rbegin()和rend()方法指出反向遍历的起始位置和终止位置。注意，前向遍历一般是从begin()到end()遍历，而反向遍历则是从ebegin()到rend()
三用数组方式遍历map
1代码
#include<map> #include<string> #include<iostream> using namespace std; int
main(){ map<int,string> mapStudent; mapStudent[1] = "student_one";
mapStudent[2] = "student_two"; mapStudent[3] = "student_three"; int iSize =
mapStudent.size(); for(int i = 1; i <= iSize; i++){ cout<<i<<"
"<<mapStudent[i]<<endl; } return 0; }
2运行
[root@localhost charpter03]# g++ 0324.cpp -o 0324 [root@localhost charpter03]#
./0324 1 student_one 2 student_two 3 student_three
3说明
用size()方法确定当前map中有多少元素。用数字访问vector时，下标是从0-（size-1），而用数字访问map，却是从1~size,这是有所不同的。
