#include <map>
#include <iostream>

using namespace std;

int main() {
  map<int,int> foo;
  map<int,char> bar;

  
  int j = foo[100];
  int k = int();

  cout << "j = " << j << endl;
  cout << "k = " << k << endl;

  char c = bar[0];
  cout << "c = {" << c << "}" << endl;

  return 0;
}