Re: Java ME or SE?

Eric Sosman <esosman@comcast-dot-net.invalid>
Mon, 10 Nov 2014 20:11:18 -0500
On 11/10/2014 7:37 PM, Martin Gregorie wrote:

On Mon, 10 Nov 2014 23:51:48 +0100, Kees Theunissen wrote:

Martin Gregorie wrote:

A modern C compiler can compile any C program that was written in the
past, including those using the original K&R syntax.

     Well, no: It won't *always* compile.

    #include <strings.h> /* <string.h> nowadays */

    #include <malloc.h> /* <stdarg.h> nowadays, sort of */

    #include <varargs.h>
    /* ... and the not-quite-compatible consequents thereof */

    #include <stdio.h>
    char *p = sprintf(...); /* worked in some old C's, not today */

    enum permissiveness { allow, forbid, restrict };

    enum roller_skate_type { side_by_side, inline };

    processTransaction(tptr, void)
        Transaction *tptr; /* the transaction to process */
        int void; /* flag: true to void the transaction */
    { ... }

    extern char *malloc();
    float matrix = (float*) malloc(rows * cols * sizeof(float));
    /* This one's moderately subtle, but potentially fatal because
     * although it may well compile, thus not providing a reliable
     * counter-example to your assertion, it can misbehave badly.

    unsigned short this = 42;
    int that = -42;
    int those = this * that;
    /* Another "It compiles" example, where "It compiles" is of
     * little comfort. Modern C gives -1764 as the result, while
     * some old C's gave 4294965532 or 63772. Again, a case where
     * "It compiles" simply isn't good enough: "It compiles," but
     * to something not intended by the author.

     Java's a lot cleaner than C in this respect (given its shorter
history, it ought to be), but still not quite perfect. Consider a
pre-1.4 source using `assert' as an identifier, or a pre-1.2 source
with a method named `strictfp'. Change is the only constant.

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