Simple C program for reading user input and writing it out as number codes.

main.c

//
//  main.c
//  Platform: OS X 10.9
//
//  Created by Jozef Izso on 26.10.2013.
//  Copyright (c) 2013 Jozef Izso. All rights reserved.
//

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main(int argc, const char * argv[])
{
    char action, inputChar;
    
    printf("Choose encryption or decryption (e/d): ");
    action = getchar();
    
    if (action == 'e')
    {
        printf("Please, enter a word to encrypt: ");
        
        fpurge(stdin);
        while ((inputChar = getchar()) != '\n')
        {
            if (isalpha(inputChar))
            {
                printf("%d ", inputChar);
            }
        }
        printf("\n");
        
        return 0;
    }
    else if (action == 'd')
    {
        printf("Decryption\n");
        
        return 0;
    }
    else
    {
        printf("Invalid choice.\n");
        return -1;
    }
}