I am reading over the KR book, and am a little stuck. What is wrong with the following? void getInput(int* output) { int c, i; for(i=0; (c = getchar()) != '\n'; i++) output[i] = c; // printf("%c", c) prints the c value as expected output[++i] = '\0'; } When I run the program it never gets out of the loop and I have to c...
I have a string (char) and I want to extract numbers out of it. So I have string: 1 2 3 4 /0 And now I want some variables, so I can use them as integer: a=1, a=2, a=3, a=4 How can I do that? ...
Why can't we initialize members inside the structure ? example: struct s { int i=10; }; Thanks in advance ...
This is just a general question - I was sitting and waiting for a bit of software to compile (we use Incredibuild here but can still take 10/15 mins) and it got me wondering, does anyone know how long it took to compile Windows XP or Vista? I did some googling but didn't really find any useful information ...
Strange program hang, what does this mean in debug? After attaching windbg I found the following: (1714.258): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=015b5c74 ebx=178a13e0 ecx=dddddddd edx=009a8ca0 esi=09fbf698 e...
I can't figure this one out. I can download a win32 binary of flex 2.5.4a from gnuwin32, but I'd like to build the latest version (2.5.35) using Visual Studio 2005. I suppose I could build in in cygwin, but where is the fun in that? http://flex.sourceforge.net/ ...
After discussing with a newly arrived developer in my team, I realized that there are still, in C++, habits of using C constructs because they are supposed to be better (i.e. faster, leaner, prettier, pick your reason). What are the examples worth sharing, showing a C constructs, compared to the similar C++ construct? For each example,...
... using any comparison operators... and without using if, else, etc. ...
I have this 'simplified' fortran code real B(100, 200) real A(100,200) ... initialize B array code. do I = 1, 100 do J = 1, 200 A(J,I) = B(J,I) end do end do One of the programming gurus warned me, that fortran accesses data efficiently in column order, while c accesses data efficiently in row order. He suggested that I t...
I just finished a test as part of a job interview, and one question stumped me - even using google for reference. I'd like to see what the stackoverflow crew can do with it: The “memset_16aligned” function requires a 16byte aligned pointer passed to it, or it will crash. a) How would you allocate 1024 bytes of memory, and align it to a...
I'm looking for ideas for a heap-manager to handle a very specific situation: Lots and lots of very small allocations, ranging from 12 to 64 bytes each. Anything bigger, I will pass on to the regular heap-manager, so only tiny blocks need be catered for. Only 4-byte alignment is needed. My main concerns are Overhead. The regular libc ...
On an embedded target I use far pointers to access some parts of the memory map. near pointer (without explicitely specifying __near): unsigned int *VariableOnePtr; Pointer to near pointer: unsigned int **VariableOnePtrPtr; far pointer: unsigned int *__far VariableTwoPtr; What is the correct way to declare a pointer to a far point...
If I have a source.c file and it uses a structure like struct a { int i; struct b { int j; } }; if this structure is to be used by some other file func.c how to do it? shall we open a new header file and declare the structure there and include that header in the func.c? or can we define the total structure in ...
hi friends i am siva sankar reddy s I was just opened the cmd in windows and creted a directory by using "md" command and opened a text file by "notepad " and I did my program in that file and given .c extention to save that file. Now I want to know how to compile and run that c program to get out put. One more thing is I need all ....
How can I convert a relative path to an absolute path in C on Unix? Is there a convenient system function for this? On Windows there is a GetFullPathName function that does the job, but I didn't find something similar on Unix... ...
In a C program (p1), how to launch a dynamically constructed command (and its arguments) that reads its standard input from p1's standard output? Note that: A method other than this stdout --> stdin piping is also OK provided it is PORTABLE across Windows and Linux. I cannot use C++, Java, Perl, Ruby, Python, etc here. Also, will t...
I read the following in a review of Knuth's "The Art of Computer Programming": "The very 'practicality' means that the would-be CS major has to learn Kernighan's mistakes in designing C, notably the infamous fact that a for loop evaluates the for condition repeatedly, which duplicates while and fails to match the behavior of most other ...
What translation occurs when writing to a file that was opened in text mode that does not occur in binary mode? Specifically in MS Visual C. unsigned char buffer[256]; for (int i = 0; i < 256; i++) buffer[i]=i; int size = 1; int count = 256; Binary mode: FILE *fp_binary = fopen(filename, "wb"); fwrite(buffer, size, count, fp_binary)...
Is there a better way than simply trying to open the file? int exists(const char *fname) { FILE *file; if (file = fopen(fname, "r")) { fclose(file); return 1; } return 0; } ...
PHP has a very nice function, isset($variableName). It checks if $variableName is already defined in the program or not. Can we build similar feature for C/C++ (some kind of symbol table lookup)? ...