C program to find the frequency of characters in a string

// C program to find the frequency 
// of characters in a string
#include <stdio.h>
#include <string.h>

// Function to print the frequencies
// of each character of the string
void printFrequency(int freq[])
{
    for (int i = 0; i < 26; i++) 
    {
        // If frequency of the
        // alphabet is non-zero
        if (freq[i] != 0) 
        {
            // Print the character and
            // its respective frequency
            printf("%c - %d\n",
                   i + 'a', freq[i]);
        }
    }
}

// Function to calculate the frequencies
// of each character of the string
void findFrequncy(char S[])
{
    int i = 0;

    // Stores the frequencies
    // of each character
    int freq[26] = { 0 };

    // Traverse over the string
    while (S[i] != '\0') {

        // Increment the count of
        // each character by 1
        freq[S[i] - 'a']++;

        // Increment the index
        i++;
    }

    // Function call to print
    // the frequencies
    printFrequency(freq);
}

// Driver Code
int main()
{
    char S[100] = "geeksforgeeks";
    findFrequncy(S);
}