C main program takes a string input and counts the number of vowels and consonants.

vowels_consonants_counter.c

//**************************************
// Name: vowels_consonants_counter.c
// Description:
//     Consonants and Vowels Counter in C
//     A sample program that will ask the user to enter a work or
//     a sentence and then the program will count how many consonants and
//     vowels in a given word or sentence by the user.
//     Take note I am using Turbo C 2.0 For DOS as my C compiler in this program.
//
//     If you have some questions please send me an email at jake.r.pomperada@gmail.com
//     and jakerpomperada@yahoo.com.
//     My mobile number here in the Philippines is 09173084360.
// By:
//     Jake R. Pomperada
//
//
// Inputs:None
//
// Returns:None
//
// Assumes:None
//
// Side Effects:None
//**************************************

/* Consonants and Vowels Counter*/
/* Written By: Mr. Jake R. Pomperada, MAED-IT */
/* Date : November 25, 2015*/
/* Tools : Turbo C 2.0 For DOS*/
#include <stdio.h>
#include <stdlib.h>

#include <ctype.h>
#include <conio.h>
int main()
{
   	char strings[200];
   	int vowels=0,consonants=0,i=0;
   	//clrscr();
   	printf("Enter a word or sentence : ");
   	gets(strings);
   	while(strings[i] != '\0')
   	{
   		if (toupper(strings[i])=='A' || toupper(strings[i])=='E' ||
   		    toupper(strings[i])=='I' || toupper(strings[i])=='O'||
   		    toupper(strings[i])=='U')
       		vowels++;
   	    if (toupper(strings[i])=='B' || toupper(strings[i])=='C' ||
   		    toupper(strings[i])=='D' || toupper(strings[i])=='F'||
   		    toupper(strings[i])=='G' || toupper(strings[i])=='H' ||
   		    toupper(strings[i])=='J' || toupper(strings[i])=='K'||
   		    toupper(strings[i])=='L' || toupper(strings[i])=='M' ||
   		    toupper(strings[i])=='N' || toupper(strings[i])=='P'||
   		    toupper(strings[i])=='Q' || toupper(strings[i])=='R' ||
   		    toupper(strings[i])=='S' || toupper(strings[i])=='T'||
   		    toupper(strings[i])=='V' || toupper(strings[i])=='W' ||
   		    toupper(strings[i])=='X' || toupper(strings[i])=='Y' ||
            toupper(strings[i])=='Z')
       		consonants++;
   	  i++;
   	}
   	printf("\n\n");
   	printf("===== DISPLAY RESULTS =====");
   	printf("\n\n");
   	printf("Total Number of Vowels : %d. ", vowels);
   	printf("\n\n");
   	printf("Total Number of Consonants : %d.",consonants);
   	getch();
}