#include <stdio.h>

#define MESSAGE 100

int main(void)
{
    char input_message[MESSAGE], termination_char;
    int input, output, message_length;

    printf("Enter a sentence: ");
    for (input = 0; input < MESSAGE; input++)
    {
        scanf("%c", &input_message[input]);
        if ( (input_message[input] == '?') || (input_message[input] == '!') ||
             (input_message[input] == '.') )
        {
            termination_char = input_message[input];
        }
    }

    printf("Reversal of sentence: ");

    message_length = MESSAGE - 1;

    for (output = message_length; output >= 0; output--)
    {   // check if end of word
        if ( (input_message[output] == " ") || (output == message_length) )
        {
            for (; (input_message[output] != " ") && (output >= 1); output--)
            {   //output = index of first letter in the word
                for (; (input_message != " ") && (output < message_length);
                     message_length++)
                {
                    printf("%c", input_message[output]);
                    // prints the word, char by char
                }
                printf(" ");
                message_length--; // make sure the same space is
                                  // is not done again
            }
        }
    }

    printf(" %c\n", termination_char);
    return 0;
}