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Use subscript operator to write value to a map

#include <algorithm> #include <iostream> #include <map> #include <utility> using namespace std; int main( ) {    const char* word[] = { "A", "B", "C", "D","E" };    const char* clue[] = { "a", "b","c", "d","e" };    map<string,string> dictionary1;    transform( word, word+sizeof(word)/sizeof(word[0]), clue,inserter( dictionary1, dictionary1.end() ),make_pair<string,string> );    cout << "There are " << dictionary1.size() << " words in the dictionary\n\n";    cout << "The clue for POPS is \"" << dictionary1["POPS"] << "\"\n"       << "The clue for TAT is \"" << dictionary1["TAT"] << "\"\n"       << "The clue for ESPO0 is \"" << dictionary1["ESPO0"] << "\"\n";    cout << "\nThere are " << dictionary1.size() << " words in the dictionary\n\n";    // use subscript operator to write value    dictionary1["ESPO0"] = "Typo in name";    cout << "The clue for ESPO0 is \"" << dictionary1["ESPO0"] << "\"";   }