Question

How to print characters that have even frequencies of occurrence in a string with C++

Answer 1

#include <iostream>
#include <cctype>
 
using namespace std;
 
void print_even_frequencies_char(string s) { 
    int letters[256] = {0}; 
     
    for (int i = 0; i < s.length(); i++) {
         if (isalpha(s[i]))
             letters[(int)s[i]]++;
    }
     
    for (int i = 0; i < 256; i++) { 
        if (letters[i] != 0 && letters[i] % 2 == 0) {
            cout << char(i) << " " << letters[i] << endl;
        }
    } 
} 
 
int main() {
    string s = "c++ programming pro oo"; 
        
    print_even_frequencies_char(s);
}
 
 
 
/*
run:
 
g 2
m 2
o 4
p 2
 
*/

 

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