C Program to find Maximum occurring Character in a String1 min read

In this tutorial, we will write a program in C to find the maximum occurring character in a string. Before that, you may go through the following topics in C

Find maximum occurring character in a string in C

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#define MAX_size 100 //MAX string size
#define MAX_char 255 //MAX character number
 
void main()
{
  char str[MAX_size];
  int freq[MAX_char];
  int i = 0, max;
  int ascii;
 
  printf("Enter the string : ");
  fgets(str, sizeof str, stdin);
 
  for (i = 0; i < MAX_char; i++)
  {
    freq[i] = 0;
  }
 
  //calculating the frequency
  i = 0;
  while (str[i] != '\0')
  {
    ascii = (int) str[i];
    freq[ascii] += 1;
 
    i++;
  }
 
  max = 0;
  for (i = 0; i < MAX_char; i++)
  {
    if (i != 32)
    {
      if (freq[i] > freq[max])
        max = i;
    }
  }
 
  printf("\nCharacter with highest frequency is: '%c'", max);
  printf("\nAnd the number of times, it appears is: '%d'", freq[max]);
}

Output:

Enter the string : Welcome to simple2code

Character with highest frequency is: 'e'
And the number of times, it appears is: '4'

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