Lets check out the dev in you.

Problem: Print "Hello World" in C in such a way that you cannot use any semicolon anywhere in the program.

Try this without using internet.

Hint: You only need to know basics of C.

void main()
{
if(printf("hello world"))
{
}
}

A file only containing the words Hello world will show the two words (among other things) when you try the file with a compiler. Or at least that‘s how I would do it. With gcc, the words will even have their own line 😀

@Electrux this question was asked during a recruitment drive

@KartikShetty cool! I'll b honest i did verify on Net that printf does return a value so... Yea...
Btw, my faculty asked me once to do the same except that there shud b no semicolon in the main() function 😉

How how

@noobSam use a macro...
#define HELLO_WORLD printf("hello world");

void main()
{
HELLO_WORLD
}

@Electrux printf does return a value. The printf family functions returns length of the resulting string

@Electrux, Here's another one find out the size of structure without using sizeof operator. (Just because you are a C/C++ enthusiast like me).

@magnusi yep... Haha i learned a new thing today.... Yaay 😊

@Electrux thats how I tried to solve this

@Electrux gotta try it out!!

All C lovers welcome to this rant. Hail Dennis!!!Hail Linus!!!

@KartikShetty make an array of two, subtract addresses. maybe there is a better way with only one, but I cant figure out anything better. Or make a struct containing the struct, with an element above and below, subtract addresses and padding

@KartikShetty well... I dunno that... But i have an intuition that it has something to do with pointers perhaps?
Btw... Glad to find a C/C++ fellow 😉😊

@KartikShetty Hail Brian!

@magnusi tried that not the correct solution. Gives an integer without computing the memory occupied by the last element in structure.

@KartikShetty comeon dont kill me with suspense man... Tell the answer!! 😁😁

@Electrux Not that I know of maybe using pointers is possible but the solution is quite simple.

@Electrux Boot up your PC and find out like I did. Took some time

@KartikShetty which solution? the second one? I think the element above and below should be something like char, where you know the size beforehand

@KartikShetty what if u create 2 pointers... Malloc one to the struct, immediately malloc the other to the struct... Get their hex addresses, convert to integer, and subtract?

@Electrux wouldn't you malloc it with malloc(sizeof(thatstruct)) ? :D

@magnusi you dont have any control on the elements in the structure. Should work for any structure of any size.

@magnusi then ima go C++ style and use new operator 😁
PS. Lol cant believe i forgot that u need sizeof to use malloc 😂😂😂😂

@Electrux yeah lol

This question was asked when I was applying for an Internship

@KartikShetty I see, well, I meant making another, different structure, with three elements, first char, second struct whose size we need to know, third char. Optionally also make that structure packed

@magnusi OK now how do you calculate the size of this second structure to find out the size of first.

@KartikShetty wait so... the new operator 2 pointer method is correct?

@magnusi Also now memory consumed is
2*structure+2byte

@Electrux I was referring to your joke

@KartikShetty ah... Lol well but wat about the solution? If ur using c++, it shud b correct shudnt it?

@Electrux Using C

Ok want to know how to do it?

@KartikShetty oh i jst thought of something! What if i cast the struct to a character pointer and printf that? The return value shud b the number of characters?

@Electrux A structure can have int, long, float any datatype variable that too of n size. How would you do this without losing out value if it is possible.

@KartikShetty according to my thought, a character is 1 byte and all others r more than 1 byte and ofc not in decimals... So it will probably throw garbage in printf but number of characters = number of bytes therefore size of struct shud b retrieved correctly... Probably m wrong haha... Do tell the solution 😁

@KartikShetty this is what I meant, working: http://pastebin.com/jEdCicws

Create two structure entities and subtract them.Done

@magnusi Yup it does. Thought you were suggesting about using arrays. Great job.

@KartikShetty thanks, I suggested two solutions in my first comment, this one and the one you revealed a while ago 😁

@magnusi @KartikShetty man these are awesome! Lol i was uselessly trying to delve into pointers haha... Btw... Whatsup with that (packed) thing in that code? I'll admit i never saw that before 😅

This was fun

@Electrux by default, compilers insert some spaces between struct members. The space is called padding. The packed attribute temoves any space between, the elements are directly next to each other

@KartikShetty got more?

@magnusi wow... Awesome... Thanks a lot 😊

@magnusi Well yeah
Find out the mid of a linked list when you dont know its size using just one loop without any other form of control transfer like recursion for that loop.

@KartikShetty oh shame, I still remember the fast&slow algorithm for this one :D

Well... U 2 r on a whole different level... So much experienced... Someday i'll b like u 2 😊

@Electrux Nice though:

void main () {
if(printf("Hello World"){
}
}

Would be nicer in my opinion...

@Lucurious well... I prefer the other style... Jst my preference :D

@Electrux experienced I am not.