#include<stdio.h>
 
void main()
{
	char str[51];
	char letter[27]={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
	int count, i;
 
	printf("Enter sentence or phrase>>>");
	fgets(str, 51, stdin);
	for(count=0;str[count]!='\0';count++)
	{
		for(i=0; letter[i]; i++)
			if(letter[i]==str[count])
				letter[i]++;
	}

			if(letter[i]==str[count])

int num[27] = {0};

int num[256] = {0}, count;

for(count=0;str[count]!='\0';count++)
{
    num[str[count]] ++;
}

for(x = 0; x < 256; x ++) {
    if(isalpha(x)) {
        /* count[x] is a count of a letter of some sort */
    }
}

#include <stdio.h>
/* #define ALL_CHARACTER */ /* enable for use all characters in RANGE */
/* #define RANGE */  /* enable for only lower case */
#ifdef RANGE
#define START 'a'
#endif
#ifndef RANGE
#define START 'A'
#endif
 
int main( void )
{     
    char character[256] = { 0 };
    int c = '\0';
 
    puts( "Enter some text:" );
 
    while ( ( c = getchar() ) != '\n' && c != EOF )
    {
        ++character[c];
    }
    for ( c = START; c <= 'z'; c++ )
    {
#ifndef ALL_CHARACTER
        if ( character[c] )
#endif
            printf( "%c = %d\n", c, character[c] );
    }
    getchar();
    return 0;
}

#include <stdio.h>
#include <string.h>
#include <ctype.h>
 
int main( void )
{
   int lettercount[26] = {0};
   char letterz[] = {"abcdefghijklmnopqrstuvwxyz"};

   char text[100];
   fputs("enter some text: ", stdout);
   fflush(stdout);
   if ( fgets(text, sizeof text, stdin) != NULL )
   {
      char *newline = strchr(text, '\n'); /* search for newline character */
      if ( newline != NULL )
      {
         *newline = '\0'; /* overwrite trailing newline */
      }
      printf("text = \"%s\"\n", text);
      
      int i;
      int j;
      int wordLength = strlen( text ); /*get the number of characters in the sentence*/
      for ( i = 0; i < wordLength; i++ )
      {
        for ( j = 0; j < 26; j++ )
        {
          if ( tolower( text[i] ) == letterz[j] ) /*tolower convert uppercase to lowercase*/
          {
            lettercount[j]++;
          }
        }
      }
   }
   
/*print out results*/
   int k;
   for ( k = 0; k < 26; k++ )
   {
     printf( "%c:%d ", letterz[k], lettercount[k] );
     printf("\n");
   }
   return 0;
}