/* ----------------------------------------------------------------------------------------------
      Program           : uprlwr.c
      Course            : 90.212
      Assignment        : Assignment #4 - Array Notation
      Objective         : This program prompts user to enter a line of text up to 50 characters.
                          It then outputs the line of text in uppercase and then in lowercase.
------------------------------------------------------------------------------------------------- */

#include <stdio.h>
#include <ctype.h>
 
/* Function prototypes */
/* ------------------- */

void safer_gets (char array[], int max_chars);

/* Begin function main */
/* ------------------- */

main()
{

      /* Declare variables */
      /* ----------------- */

      char  text[51];
      int   i;


      /* Prompt user for line of text */
      /* ---------------------------- */


      printf ("\nEnter a line of text (up to 50 characters):\n");

      safer_gets(text,50);

 
      /* Convert and output the text in uppercase characters. */
      /* ---------------------------------------------------- */

      printf ("\nThe line of text in uppercase is:\n");

->    i = 0;
->    while ( text[i] != '\0')            /* could have been: while ( text[i] ) */
->          putchar( toupper(text[i++]) );
 

      /* Convert and output the text in uppercase characters. */
      /* ---------------------------------------------------- */

      printf ("\n\nThe line of text in lowercase is:\n");

->    i = 0;
->    while ( text[i] != '\0')            /* could have been: while ( text[i] ) */
->          putchar( tolower(text[i++]) );


     /* Add carriage return and pause output */
     /* ------------------------------------ */

     printf("\n");
     getchar();
     
} /* end main */


/* Function safer_gets */
/* ------------------- */


void safer_gets (char array[], int max_chars)
{
  /* Declare variables. */
  /* ------------------ */

  int i;

  /* Read info from input buffer, character by character,   */
  /* up until the maximum number of possible characters.    */
  /* ------------------------------------------------------ */

  for (i = 0; i < max_chars; i++)
  {
     array[i] = getchar();


     /* If "this" character is the carriage return, exit loop */
     /* ----------------------------------------------------- */

     if (array[i] == '\n')
        break;
  
   } /* end for */

   /* If we have pulled out the most we can based on the size of array, */
   /* and, if there are more chars in the input buffer,                 */
   /* clear out the remaining chars in the buffer.                      */
   /* This is equivalent to the fflush() function.                      */
   /* ----------------------------------------------------------------  */

   if (i == max_chars )

     if (array[i] != '\n')
       while (getchar() != '\n');

   /* At this point, i is pointing to the element after the last character */
   /* in the string. Terminate the string with the null terminator.        */
   /* -------------------------------------------------------------------- */

   array[i] = '\0';
 

} /* end safer_gets */