map declaration c 2b 2b

1//assuming your variables are called : variables_
2#include <map>
3#include <string>
4
5std::map<int, std::string> map_;
6map_[1] = "mercury";
7map_[2] = "mars";
8map_.insert(std::make_pair(3, "earth"));
9//either synthax works to declare a new entry
10
11return map_[2]; //here, map_[2] will return "mars"

1#include <bits/stdc++.h>
2#include <iostream>
3#include <map>
4using namespace std;
5void mapDemo(){
6	map<int, int> A;
7	A[1] = 100;
8	A[2] = -1;
9	A[3] = 200;
10	A[100000232] = 1;
11	//to find the value of a key
12	//A.find(key)
13	
14	//to delete the key
15	//A.erase(key)
16	
17	map<char, int> cnt;
18	string x = "Sumant Tirkey";
19	
20	for(char c:x){
21		cnt[c]++;//map the individual character with it's occurance_Xtimes
22	}
23	
24	//see  how many times a and z occures in my name
25	cout<< cnt['a']<<" "<<cnt['z']<<endl;
26	
27} 
28	
29int main() {
30	mapDemo();
31	return 0;
32}