Linux Journal Interview With Brian Kernighan

pndiku writes "Linux Journal has an interesting interview with Brian Kernighan where he talks about AWK, AMPL and how he had nothing to do with the creation of C."

Comments

Re:If I were Brian...

[AlecC]

int foo, *bar; creates an integer named foo, and a pointer to an int named bar. Right? Or am I wrong?

So you have one declaration line which created variables of two totally disinct types. Fine for the opriginal creator, lousy for the maintainer, who sees a line declaring ints and had to do a serious double take to find that some of them are actually pointers. Abuse further as

int foo, *bar, flash, *bang, up, *down, left, *right;

Without reading the line again, what was the type of "up"?

And as for the other, I can never define any sort of function pointer in one line: I always have to typedef tthe function and then have a pointer to it. While I can work out, with a manual in hand, how to do it in one line, the syntax is so unintuitive that I never do it: I will just have to reach for the manual again wh
en I maintain it.

The mistake I would junk is allowing enum {fred=36, bill=19, joe=333} ; Which confuses predefined constants with the classic enumeration. The cost saving of a lookup table to convert the 0, 1, 2 sequence is tiny, and the knock on effects are horrible.

Re:If I were Brian...

[ajs]

You are exactly correct, and I have no idea what the original poster's problem with it was.

[ajs@put /tmp]$ cat > /tmp/c.c
#include <stdio.h>
void
main(int argc, char *argv[]) {
int i, *j;
i = 1;
*j = 2;
printf("i=%d, j=%d\n", i, *j);
exit(0);
}
[ajs@put /tmp]$ gcc -o /tmp/c-test /tmp/c.c
/tmp/c.c: In function `main':
/tmp/c.c:3: warning: return type of `main' is not `int'
[ajs@put /tmp]$ /tmp/c-test
i=1, j=2

Perhaps he was thinking of "int *i, j" which isn't all that bad in terms of confusion until you started seeing stroustrup's style, which I *hated* from day one of, "int* i" which of course lead to people using, "int* i, j".

You can write badly obfuscated code by abusing visual association in just about every language, but this particular gotcha should have tipped off Stroustrup VERY early on that his style was agegeously misleading, and a good technical editor should never have let him publish a book with such incomprehensible gibberish.

That very thing is one of the primary reasons I didn't use C++ for years (not to mention that I regretted it when I did). My thinking was that if the creator of the language didn't see how damaging it was to introduce confusion in his published writing, then he wasn't likely to avoid such in a programming language. I think ANSI C++ stands as a monument to the correctness of my thinking on that point!

these guys

[Anonymous Coward]

My aunt used to work with these guys at the Labs here in NJ quite often. Shes dieing now and we sit for hours and talk about how she used to program in C and how much she loved unix. Hours on end of stories about these guys and different projects. I work with a guy now who worked with her, lots of stories from him as well. Awesome stuff, true geniuses. Gotta thank these guys for changing the world.

-- chris

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