Question

How to count the occurrences of each word in a string with C++

Answer 1

#include <iostream>
#include <sstream>
#include <map>

std::map<std::string, int> countOccurrences(std::string s) {
    int count = 1;
    std::map<std::string, int> mp;
    std::istringstream iss(s);
    std::string word;
      
    while (iss >> word) {
        std::pair<std::map<std::string, int>::iterator, bool> pr;

        pr = mp.insert(std::pair<std::string, int>(word, count));

        if (pr.second==false) {
            pr.first->second++; 
        }     
    }
       
    return mp;
}

int main() {
    std::string s = "c python c++ java c c++ php c++ c c java";

    std::map<std::string, int> mp = countOccurrences(s);
    
    std::map<std::string,int>::iterator itr ;

    for (itr = mp.begin(); itr != mp.end(); itr++) {
        std::cout << itr->first << " - " << itr->second << '\n';
    }
    
    return 0;
}
 
 
 
  
/*
run:
  
c - 4
c++ - 3
java - 2
php - 1
python - 1
 
*/

 

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