tolower()               Convert 'c' To Lowercase, If Appropriate

 #include   <ctype.h>

 int        tolower(c);
 int        c;                           Character to be converted

    tolower() converts 'c' to lowercase, if 'c' is an uppercase letter.
    If 'c' is already lowercase, it remains unchanged.

       Returns:     The converted character 'c'. There is no error
                    return.

   -------------------------------- Example ---------------------------------

    The following statements convert strings to lowercase before printing
    them.

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

           char string[15] = "Alphabet Soup";
           int x;

           main()
           {
               for (x = 0; x < strlen(string); x++)
                   printf("%c",tolower(string[x]));
               printf("\n");
           }