Map c++

Map declaration c++

//assuming your variables are called : variables_
#include <map>
#include <string>

std::map<int, std::string> map_;
map_[1] = "mercury";
map_[2] = "mars";
map_.insert(std::make_pair(3, "earth"));
//either synthax works to declare a new entry

return map_[2]; //here, map_[2] will return "mars"

Map in cpp

#include <map>

// empty map container 
map<int, int> gquiz1; 
  
// insert elements in random order 
gquiz1.insert(pair<int, int>(1, 40));

Map c++

//Since c++17
for (auto& [key, value]: myMap) {
    cout << key << " has value " << value << endl;
}
//Since c++11
for (auto& kv : myMap) {
    cout << kv.first << " has value " << kv.second << endl;
}

Map in cpp

#include <map>

int main(){
  //new map
  std::map <int,int> myMap;
  myMap[0] = 1;
  myMap[1] = 2;
  myMap[2] = 3;
  myMap[3] = 4;
}

Similar codes

0 vote103 views1 answer
QT form doesn't take changes
C++
1 vote104 views1 answer
Hello world c++ visual studio
C++
2 votes131 views1 answer
How to make crypto
C++
0 vote109 views1 answer
C++ asio read full socket data into buffer
C++
5 votes107 views2 answers
Comparator priority queue c++
C++
0 vote108 views1 answer
C++ calorie calculator using a for loop
C++
0 vote104 views2 answers
Find a member variable in a vector of objects cpp
C++
1 vote61 views1 answer
Copy constructor 2d array c++
C++
0 vote96 views1 answer
Count bit 1 c++
C++
0 vote113 views1 answer
C++ construnctor
C++