Basically, a program to find the largest prime factor of a number. Don't know if the logic is correct cuz I can't run it to test it. I know this is long. But please forgive me. //largest_prime.c #include <stdio.h> int main() { int num,large; int prime(int); int lprime(int); printf("Enter number: "); scanf("%d",&num)...
I have a file pointer which I am using with fgets() to give me a complete line along with the new line in the buffer. I want to replace 1 char and add another character before the new line. Is that possible? For example: buffer is "12345;\n" output buffer is "12345xy\n" This is the code: buff = fgets((char *)newbuff, IO_BufferSize...
Hello, I have a few source code files, such hashtable.c and such. The main issue is that when I write my main.c as such: #include "tokens.h" #include <stdio.h> void yyerror(char *errorMsg) { fprintf(stderr, "%s\n", errorMsg); } main() { yyparse(); hsh = createHashtable(); } And at the top of my yacc file (parser.y), I want to ...
if i have a several header files :lets say 1.h,2.h,3.h lets say the all the three header files have #include<stdlib.h> and one of the include files in them. when i have to use all 3 header files in a c file main.c it will have 3 copies #include<stdlib.h> after the preprocessor.how does the compiler handle this kind of conflict. is this...
Hi, I compiled libxml2 with BCC 5.5 command line compiler, now I have lots of .obj files which I'd like to link into my Delphi application. Unfortunately, I get lots of "Unsatisfied forward or external declaration" errors, pointing to standard C library functions like memcpy, open, recv etc ... What should I do to compile it correctly?...
Dear developers, I have a buffer with many positive 16bit values (which are stored as doubles) that I would like to quantize to 8bit (0-255 values). According to Wikipedia the process would be: Normalize 16 bit values. I.e. find the largest and divide with this. Use the Q(x) formula with M=8. So I wonder, if C have a function that ...
Confused with the problem here. New to C, as made obvious by the below example: #include <stdlib.h> #include <stdio.h> void pass_char_ref(unsigned char*); int main() { unsigned char bar[6]; pass_char_ref(&bar); printf("str: %s", bar); return 0; } void pass_char_ref(unsigned char *foo) { foo = "hello"; } To my understan...
What does it mean for some network event mechanism (i.e. epoll/poll/select) to be edge or level triggered? ...
I'm following the example of code available in: http://www.openssl.org/docs/crypto/sha.html# After the following: EVP_DigestFinal_ex(&mdctx, md_value, &md_len); the final digest is stored in md_value. I'd like to copy that digest to another character array of equal size. This is a two part problem though. I'm not understanding what e...
I have a struct for holding a 4D vector struct { float x; float y; float z; float w; } vector4f And I'm using a library that has some functions that operate on vectors but take float pointers as their arguments. Is it legal to call something like doSomethingWithVectors( (float *) &myVector)? ...
Using gdb, I am trying to trace the function calls of a web server. I set breakpoints on every function call and when I tell gdb to 'run' it breaks at all the right places while the server starts up. Then gdb says 'Program ended with code 01' and doesn't stop at breakpoints anymore (obviously). However, the web server is still running. ...
I have a small course project that would best have a user-friendly front end. It's a network sniffer, I coded the program with C and Linux. And now I am hoping to make it more ``user-friendly". ...
I'm learning a little C over the holiday weekend, and I started to look at other programs written in C. I ended up looking at GNU Netcat, thinking it would be a good example. I was a bit shocked to see a 600 line main() function. Is this normal? If it is normal is this considered good C coding practices? ...
I got multiple versions of libc installed, how do I choose which to link with at compile time? Right now i'm compiling like g++ prog.cpp ...
If the program counter points to the address of the next instruction to be executed, what do frame pointers do? ...
A question yesterday about doubled-checked locking started a chain of thoughts that left me unsure about a simple situation. In the following code, is it possible to hit the printf of “No longer in sync”? In this simple example, the values would likely be on the same cache line, so I think it would be less likely (assuming the possibili...
I'm normally programming in c++, but are using some clibrary functions for my char*. Some of the manpages like for 'getline', says that input should be a malloced array. Is it ok, to use 'new' instead? I can see for my small sample that it works, but could this at some point result in some strange undefined behavior? I know that a 'n...
I have two structures in C program: SmallStructABC and BigStructXYZ I have several members in both of them; SmallStructABC's all 10 members are exactly same as first 10 members of BigStructXYZ. BigStructXYZ has 50 additional members. Is it OK to type-cast this two structures to each other? SmallStructABC *i = (BigStructXYZ*)j; BigStr...
I'm writing a shell in C. While I don't expect many other people to use it, I'd like to practice writing maintainable and well-organized code. I've noticed the following pattern in a number of my functions, so before it solidifies, I'd like it to be fully vetted. As an example, consider the following function: int foo(int param...) {...
Hello, i got a question for reading an bmp image. How can i get the pixel value(R, G, B values) in an bmp image? Can anyone help me using the C programming language? ...