CPP

check if key exists in map c++

if ( m.find("f") == m.end() ) {
  // not found
} else {
  // found
}

check if a key is in map c++

if ( m.find("f") == m.end() ) {
  // not found
} else {
  // found
}

c++ check if key exists in map

if (std::map.count(key) == 0)
{
	// Not found
}
else
{
 // Found
}

c++ map key exists

#include <iostream>
#include <map>

using std::cout; using std::cin;
using std::endl; using std::map;
using std::string;

int main(){
    string key_to_find;
    std::map<string, string> lang_map = {{"j", "Julia",},
                                         {"p", "Python",},
                                         {"m", "MATLAB",},
                                         {"o", "Octave",},
                                         {"s", "Scala",},
                                         {"l", "Lua",}};

    for (const auto & [key, value] : lang_map) {
        cout << key << " : " << value << endl;
    }

    cout << "Enter the key to search for: ";
    cin >> key_to_find;

    if (lang_map.find(key_to_find) != lang_map.end()) {
        cout << "Key Exists!" << endl;
    }

    return EXIT_SUCCESS;
}

c++ map key exists

if ( !(myMap.find("key") == myMap.end()) ) {	// "key" exists	
  
} else {	// not found	
  
}