Use find() to find an entry in a map : map find « map multimap « C++ Tutorial

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C++ Tutorial » map multimap » map find 
23.5.4.Use find() to find an entry in a map
#include <iostream>
#include <string>
#include <map>
#include <utility>

using namespace std;

void show(const char *msg, map<string, string> mp);

int main() {
  map<string, string> phonemap;

  phonemap["A""444-555-1234";
  phonemap["B""555-555-6576";
  phonemap["C""555-555-9843";

  show("Here is the original map: ", phonemap);

  phonemap["B""555 555-5555";
  cout << "New number: " << phonemap["B"<< endl;

  // Use find() to find a number.
  map<string, string>::iterator itr;
  itr = phonemap.find("B");
  if(itr != phonemap.end())
    cout << "Number is " << itr->second << endl;

  return 0;
}

// Display the contents of a map<string, string> by using an iterator.
void show(const char *msg, map<string, string> mp) {
  map<string, string>::iterator itr;

  cout << msg << endl;

  for(itr=mp.begin(); itr != mp.end(); ++itr)
   cout << " " << itr->first << ": " << itr->second << endl;

  cout << endl;
}
23.5.map find
23.5.1.Map find demo
23.5.2.map: find_if
23.5.3.Find value by key
23.5.4.Use find() to find an entry in a map
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