map-find

////////////////////////////////////////
//      2018/05/01 14:40:00
//      map-find

// find a given element
#include <iostream>
#include <map>

using namespace std;

int main(){
    typedef map<int, char>  M;
    char ch = 'A';
    M m;

    for (int i = 0; i < 5; i++){
        m[i] = ch++;
    }

    M::iterator it = m.begin();
    cout << "map m:" << endl;
    while (it != m.end()){
        cout << it->first << "-" << it->second << endl;
        it++;
    }

    it = m.find(4);
    if (it != m.end()){
        cout << "element key '4' has value " << it->second << endl;
    }else{
        cout << "element key '4' not found." << endl;
    }
    return 0;
}

/*
OUTPUT:
    map m:
    0-A
    1-B
    2-C
    3-D
    4-E
    element key '4' has value E
*/