cat.c

ITT: make your best, most elegant implementation of cat(1) in C. Doesn't have to be POSIX compliant; for example, mine takes no option arguments because that's how I think it should be, whereas I think that POSIX specifies a few options.

#include <stdio.h>
int main(int argc, char **argv) {
    char b[4096];
    FILE *f = stdin;
    int i;
    size_t s;
    if (argc == 1)
        goto noargs;
    for (i = 1; i < argc; i++) {
        f = fopen(argv[i], "rb");
        if (!f) {
            fprintf(stderr, "%s: failed to open %s\n", argv[0], argv[i]);
            continue;
        }
        noargs:
        while ((s = fread(b, 1, 4096, f)))
            fwrite(b, 1, s, stdout);
    }
    return 0;
}

Why is this the best in my opinion? It is short, simple, fast, serves just the purpose of concatenating files and no more, and even has a clever and elegant trick to handle the special case of no arguments without code duplication.

>>36,37
It never happens, the probability is exactly zero.

This has to do with the cardinality of the rational numbers versus the cardinality of the irrational numbers.

Try doing the (lebesgue) integral of the probability distribution over any real interval that extends over more than a single real number.