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  1. #include<iostream>  
  2. #include<map>  
  3. #include<string>
  4. #include<utility> 
  5.  
  6. using namespace std; 
  7.  
  8. int main() {  
  9.     typedef map<string, int> mapType;  
  10.     mapType populationMap;  
  11.  
  12.     populationMap.insert(pair<string, int>("Maharashtra", 7026357));  
  13.     populationMap.insert(pair<string, int>("Rajasthan", 6578936)); 
  14.     populationMap.insert(pair<string, int>("Karnataka", 6678993));
  15.     populationMap.insert(pair<string, int>("Punjab", 5789032)); 
  16.     populationMap.insert(pair<string, int>("West Bengal", 6676291));  
  17.  
  18.     mapType::iterator iter;  
  19.     cout << "====Population of states in India====";  
  20.     cout << "\nSize of populationMap: " << populationMap.size() << "\n";  
  21.  
  22.     string state_name; 
  23.     cout << "\nEnter name of the state: ";  
  24.     cin >> state_name;
  25.     iter = populationMap.find(state_name);  
  26.  
  27.     if (iter != populationMap.end()) {  
  28.         cout << state_name << "'s population is " << iter->second << "\n";  
  29.     } else {  
  30.         cout << "Key is not in populationMap\n";   
  31.     }  
  32.  
  33.     populationMap.clear();  
  34.     return 0;  
  35. }
  36.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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====Population of states in India====
Size of populationMap: 5

Enter name of the state: Key is not in populationMap
https://ideone.com/JpCXzk
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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