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#include <stdio.h>
#include <stdlib.h>
...
    printf( "\nfinal size: %lld; took %.3f seconds\n", n * 1000, elaps
+ed );
    exit( 0 );
}

mehere@mehere-desktop:~$ gcc mem.c -o memtest
mehere@mehere-desktop:~$ ./memtest 

final size: 1000000000; took 0.000 seconds

#include <stdio.h>
#include <time.h>
...
    printf( "\nfinal size: %I64d; took %.3f seconds\n", n * 1000, elap
+sed );
    exit( 0 );
}