Question

How to find the second most frequent character in a string with C

Answer 1

#include <stdio.h>
#include <string.h>

char GetSecondMostFrequentChar(char s[]) {
    int count[256] = { 0 }; // 256 = ASCII table size
    size_t size = strlen(s);
  
    for (int i = 0; i < size; i++) {
        count[s[i]]++;
    }

    int first = 0, second = 0;

    for (int i = 0; i < 256; i++) {
        if (count[i] > count[first]) {
            second = first;
            first = i;
        }
        else if (count[i] > count[second] && count[i] != count[first]) {
            second = i;
        }
    }

    return second;
}

int main() {
    char str[] = "bbaddddccce";

    printf("%c", GetSecondMostFrequentChar(str));

    return 0;
}




/*
run:

c

*/

 

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