type casting in pointers
what does int *ptr=(int *)100 mean... i know its something to do with typecasting.Code:#include<stdio.h> int main(){ int *ptr=( int *)1000; ptr=ptr+1; printf(" %u",ptr); return 0; }
well output is 102... it's clear tat ptr initially is 100 and after ptr+1 it is now 102. But how is it represented in memory. please clear my doubts. thank you
It means "pretend that this number is really the address of a pointer to an integer". This will answer your second question:Code:printf( "sizeof int = %d\n", sizeof( int ) );
Quzah.
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Probably your sizeof(int) is 2 bytes. What is your platform?
It is the compiler, guaranteed to be Turbid Crap
Originally Posted by anduril462
Warning: Some or all of my posted code may be non-standard and as such should not be used and in no case looked at.
I'm not very experienced with pointers but looking upon your code, it seems that by
int *ptr=( int *)1000;
you are assigning address for an integer type data.
ptr=ptr + 1;
caused the address to add up as per the pointer arithmetic.
printf(" %u",ptr);
I'm pretty sure you know what this statement does, its trying to echo the pointed address stored in the pointer variable ptr.
Compiling it with Codeblocks echoed out the result 1004 and with Turbo C the result was 1002. This is because Codeblocks works full 32 bit as per my PC and Turbo C in 16 bit.
By the way, this is an amateur explanation and I have interpreted in regard to my understanding.
win7 using turboc++ 1.4
My condolences ... twice.
You won't have much choice but to live with Win7... but you really should get a better compiler...
If you're only interested in C programming (no C++) your best bet is probably Pelles C... smorgasbordet - Pelles C
> win7 using turboc++ 1.4
Free Developer Tools - Visual Studio 2010 Express | Microsoft Visual Studio
smorgasbordet - Pelles C
Code::Blocks
Yes, we all know your educational institutions are stuck in the stone age of computing. Feel free to play along with them, but get some real education for yourself in the meantime by learning what is used in the REAL WORLD. The "certificate" you get at the end will only be good enough to get you your first job. It will be useless from that point on, as what will count is what you know about all the modern stuff.
Don't be one of these
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If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
You've kidding right?
TurboC++ 1.4 was released in 1991, that's 4 years before even Windows 95 was released. Twice that long ago they were still using punch cards to program! It is literally listed as Antique software and is only available in embarcadero's software museum.
I mean seriously, how does that even run on a modern PC?!
Must be a history buff...
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Windows 7 is backward compatible
Neither Turbo C nor the 16 bit executables it creates will run on any 64 bit version of Windows.Windows 7 is backward compatible
You will simply get an error saying the program image is invalid.
Of course you have ! It is all about choices.
Yes, its a pain in the .... when it comes to running Turbo C in a 64 bit PC. My friends had a lot of trouble trying to get it to run, they even tried DosBox, until I suggested the DevC++, but I use CodeBlocks though
Code::Blocks is not a compiler... it is an Integrated Developer's Environment... basically a glorified text editor. Code:Blocks is supplied from the developer's site with a copy of MinGW which is a 32 bit only compiler.Yes, its a pain in the .... when it comes to running Turbo C in a 64 bit PC. My friends had a lot of trouble trying to get it to run, they even tried DosBox, until I suggested the DevC++, but I use CodeBlocks though
Dev C++ is another IDE. It used either CygWin or MinGw and produced 32 bit executables but has been abandoned for most of a decade by it's developer. The compiler supplied with DevC++ is now superceded by at least 3 generations of development by the Gnu team.
So basically you moved your friends from a programming anachronism to abandonware.
You did a little better for yourself, but you're still stuck on 32 bit code in a 64 bit world.
AND... be aware that using C++ compilers for C code can lead to some highly non-standard practices if one is not watchful of the coding standards used... One example is that a C++ compiler will complain if you do not typecast the return value of malloc() but in C this is considered bad practice since malloc() simply returns an address.
As for DosBox... well, that's one of those stupid things we wish we could dis-invent. Who in their right mind wants to run DOS in this day and age?
guys... vl i would really appreciate if u could help me understand what int *p=(int *)100 mean. Discussion about the platforms were very much helpful .Thnakxx a lot
