Maps can store only unique keys. : Map « Data Structure « C++






Maps can store only unique keys.

Maps can store only unique keys.
#include <iostream>
#include <map>
using namespace std;

int main()
{
  map<char, int> mapObject;
  pair<map<char,int>::iterator, bool> res;

  res = mapObject.insert(pair<char, int>('A', 65));
  if(res.second) 
     cout << "Insertion occured.\n";

  res = mapObject.insert(pair<char, int>('A', 99));
  if(!res.second) 
     cout << "Duplicate not allowed.\n";

  map<char, int>::iterator p;
  
  p = mapObject.find('A');
  cout << "Its ASCII value is " << p->second;

  return 0;
}



           
       








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