Frequncy Of Each Character

C program to read a string and output the frequency of each character
in that string.

Source Code:

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


int main()
{
   char string[100];
   int c = 0, count[26] = {0};
   clrscr();

   printf("Enter a string\n");
   gets(string);

   while (string[c] != '\0')
   {
      // Considering characters from 'a' to 'z' only
      //  and ignoring others
      if (string[c] >= 'a' && string[c] <= 'z')
      count[string[c]-'a']++;
      c++;
   }

   for (c = 0; c < 26; c++)
   {
      // Printing only those characters
       whose count is at least 1

      if (count[c] != 0)
      printf("%c occurs %d times in the entered string.\n",c+'a',count[c]);
   }

   getch();
   return 0;
}
output:

Enter a string
He is a very good boy
a occurs 1 times in the entered string.
b occurs 1 times in the entered string.
d occurs 1 times in the entered string.
e occurs 2 times in the entered string.
g occurs 1 times in the entered string.
i occurs 1 times in the entered string.
o occurs 3 times in the entered string.
r occurs 1 times in the entered string.
s occurs 1 times in the entered string.
v occurs 1 times in the entered string.
y occurs 2 times in the entered string.