/* Using the strlen() function. */

#include <stdio.h>
#include <string.h>

main()
{
     size_t length;
     char buf[80];

     while (1)
     {
         puts("\nEnter a line of text; a blank line terminates.");
         gets(buf);

         length = strlen(buf);

         if (length != 0)
             printf("\nThat line is %u characters long.", length);
         else
             break;
     }
     return(0);
}