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 strlen()                Get String Length

 #include   <string.h>

 size_t     strlen(string);
 const char *string;

    strlen() gets the length of 'string'. The terminating null character
    ('\0') is not included in the length.

       Returns:     The string length.  A length of zero means the string
                    is empty.  There is no error return.

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

    This example makes sure 'string2' is not empty before copying it to
    'string1'.

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

           char string1[50];
           char string2[50] = "bumble bee";
           int len;

           main()
           {
               if ((len = strlen(string2)) > 0)
                  strcpy(string1,string2);
               printf("%s",string1);
           }