How is This Output Coming?

Totally agree !!

QBasic was the all time simple yet versatile program.

While I can write in VBasic, it was obviously designed for those who like "pretty", and was also designed to torment those of us who dabble in code.

Hi

thanks .... this explains all...

thank you.

check K_fry's india bix link which has the same Q and explanations

Great explanation of the poorly writen program, and how it should have been done.
KISS principal should always be applied to writing code.
Del

This has been one of my biggest pet peeves about software programmers. I have seen enough of them over complicate their code for no other reason than to parade their mastery of the C language syntax.

In the aviation industry we must keep it readable and maintainable. Code written by one person must be readily maintainable by anyone else.

While that particular code snippet was probably written as a software homework problem, I contend it is a lesson on what not to do. A better way to do this is as follows:

int x=1, y=1; // Initialize x & y.

while (Y)
{
if (x++ <= 5) // Test x, then increment.
{
y = TRUE; // If less than 6, y is TRUE.
}
else
{
y = FALSE; // Else, y is FALSE.
}

printf("%d %d\n",x,y); // Print value of x and y.

} // End while (y)

Sorry about the formatting...

The only other reason to do this differently might have to do with code efficiency. In those cases you may be forced to use C trickery or even embedded assembly language to meet design requirements.

If you do, you would be expected to use copious comments to explain what you are doing and why.

Great example of nicely commented code. GA

Switch to Delphi. It is not stupidly obscure.

Nor is it as powerful.

How do you define "powerful"? Dephi works for our realtime machine vision applications. They have some complicated mathemetics and handle 15 camera frames per second very successfully. And you can read the code.

C is powerful because it can be used as an abstrated high level programming language as well as a low level language with the possibility of even embedding and/or calling assembly language when required.

It is a very mature language that is the most universally used programming language in the world. There are more programmers that know C and C++ than Delphi, therefore it is easier to source software engineers.

C is highly transportable from one hardware platform to the next.

C can be written to nearly the same efficiency as assembly code if done wisely and every processor and microprocessor sold on the planet has at least one C compiler available for it.

Particularly in the low level microcontroller world C is used universally. I don't know of any microcontroller that uses Delphi. I imagine there may be some that do, but C beats Delphi hands down in that world.

So I got it at trick one!

This illustrates the myth of 'readability' in C

There is a perfectly good 'while' statement which if used would have made the whole thing pretty obvious.

Or write out the condition 0< y<= 5 in full... add a sprinkling of brackets and ; for correct syntax

Trying to cram the whole program onto one line is self defeating.

If you break it down in to simple steps and code it sensibly it will be readable and easy to debug.....

How C can accept that code is beyond me, while it will throw out stuff that makes much more sense.

Del

LOL...

these are Questions used for testing once C skills but not an object for company source codes...

i was very much confused on how did x = 1 and y =1 be printed...

could understand by the time C echos the output , x has already become 2

Frank

If you want a specific answer you need to ask a specific question.

Even your last post makes no sense.

x=1 and y=1 were NOT printed.
The printout starts with 2

printf is the function that actually prints, but it only prints what you tell it to.

You have wasted the time of a lot of helpful people.

I'm out of this one.
Del

I think that kind of code skill is a bad thing. It may be good to at least untangle or understand that kind of syntax...

However, if you worked for me and wrote code like that I would fire you!

And if you didn't understand why I fired you, I fire you again!!!

The OPs original question looks identical to a homework that was in a book back when I was in school.

This is a purely instructive (textbook) example, and I would guess that it is intended to challenge the student to untangle difficult-to-read code. I've been in the situation of having to read and modify someone else's undocumented code, and having the ability to do so can be useful, or even essential. Among other things, it enables you to rewrite the original code so others can understand it.

I imagine we have all commented out a section of code because we can't tell wtf it was intended to do. We've all no doubt found code with sections commented out and wondered why the code was there in the first place -- did it ever do anything useful? Did the original programmer try something and then forget to delete it all together?

I often think that Microsoft's code must be full of worthless garbage. Open Office is about 1/10th the size, last I checked.

I could be wrong, but I'd guess original intent was to increment x until it is greater than 5, reporting values and the result of the comparison. This could be cleanly and conventionally served by:

for (int x=1; x <= 5; ++x) printf("%d %d\n",x,x<=5);

(Though professionally, I almost never leave the statement controlled by the "for" statement unbraced, similarly with do, if, or while)