#include <stdio.h>
#include <string.h>  /* need to include for strlen, strcmp, strcpy functions */
#define SIZE 80

int main()
{

  char word1[SIZE + 1] = "apples";
  char word2[SIZE + 1] = "ALIGATORS";
  char word3[SIZE + 1];
  char word4[SIZE + 1];

  int i;

  strcpy (word3, word1);
  strcpy (word4, word2);

  printf ("This way using toupper and tolower functions DOESN'T work!\n\n");
 
  printf ("word 1 is: %s\n", word1);
  printf ("word 2 is: %s\n", word2);
  printf ("word 3 is: %s\n", toupper(word3));
  printf ("word 4 is: %s\n", tolower(word4));

  printf ("\n\nThis way using toupper and tolower functions works:\n\n");

  for (i = 0; i < strlen(word1); i++)
    word3[i] = toupper(word1[i]); 

  for (i = 0; i < strlen(word2); i++)
    word4[i] = tolower(word2[i]);


  printf ("word 3 is: %s\n", word3);
  printf ("word 4 is: %s\n", word4);
     

}