C / C++ Forum

#include <stdio.h> #include <stdlib.h> #include <string.h> void select_sort(void *base, size_t nelem, size_t width, int (*fcmp) (const void *, const void *)) { void *min; int minindex; int i,j;

Can anyone tell me what I'm doing here. #include <stdio.h> #include "p.h" extern int show(const char *p){ printf(%c,p);} Compile into p.o

I am writing a recursive program to draw the lines recursively, given the range and number of intervals (n) between the range. The problem is I don't know how to draw the line in point 0.375, as you see below. Please advise! Thanks! #include <iostream> using namespace std;

Hi all! I have an int that comes with a value like 0x07fa and I have to turn it into a float value of 204.2 decimal to display it.... if I try to divide it by 10 I get bogus numbers. I presume I have to make it decimal before calculating, but I am not sure about it. Any light upon this simple (or it seems to me so, at least) begginner...

Does any here knows how to use unicode in c program to display like japanese or Russian characters? thanks

Hi, I am studying K&R book. On the multidimensional Arrays chapter they say "int (*daytab) is a pointer to an array of 13 integers. The parenthesis are necessary since brackets have higher precedence than *. Without parenthesis, the declaration int *daytab is an array of 13 pointers to integers."

Hi, I have a problem with the c-api function mysql_query. When I try to send these query "SELECT a FROM b" the function mysql_query hang's up and the program stops at the codeline. If I kill the programm, the bash said segmentation fault malloc_consolitat error. I have mysql version 4.15

Hi all, I've a C program which was originally developed under Sun Solaris(OS,2.6,gcc 2.95). I'm trying to migrate it to our linux system(Mandrake 9.0,2.4.19,gcc 3.2). Following is the MAKEFILE: CC=gcc

"pthread_delay_np" function can make a thread sleep, but it is a function in Unix and not POSIX, so i did not compile my code...what to do for me?? i just want to make a sleep for the thread, RedHat Linux thread lib has not pthread_delay_np function, how to do? thx.

If I have: unsigned char value = 0xBD; unsigned char 2bits = 0x02; How do I set the two MSB in value to the two LSB in 2bits without changing any other bits in value? <mytry> value &= 0x3F; //set those two bits to zero

I have a declaration of a pointer to an array of a struct as follows: struct foo (*a); And I have an array of a struct as follows: struct foo b; However, a = &b returns an error (illegal assignment to constant).

Are the bitwise operators >>, <<, &, |, ~, ^ only defined for non-negative values? The little program below produces the output 3 255 I expected to get the 3 but why does it produce the 255 when the variable c is not typecast first?

I have a .c file with a general code. It can be compiled with different constants for different applications. For example char a; where BYTE_SIZE is a constant defined in an external (.h?) file.

If I do something like the following: unsigned int bar=10; Then use, -bar with the unary '-' and assign this value to an int, does this invoke undefined behavior in anyway? Basically I have: unsigned int bar=10; int foo;

How to make (link) the program with it? Is there anyone who works with vgl?

What style do you prefer? Where to place brackets? How to name variables, functions, constants, etc. How do you format your source code? Do you write comments?

Hi. Thanks to Eric Sosman for showing me what was wrong with my code in an earlier posting. He wrote, quoting me: >> I want to read a line of decimal integers from standard input into an >> array, stopping when a newline is encountered, and I'd like the >> function to return the number of values read in. >> >> ----------------------------...

Could someone who is knowledgable about C please IM me. I'm having a problem with my C program and have been working at it for like 5 hours, I know it's something simple.

Hi everybody, I have a problem with the following piece of code: 141: /* A data block to manage a single log target: */ 142: typedef struct { 143: apr_reslist_t *dbs; /* connection pool */ 144: 145: const char *uri; /* the complete log uri.. */

Problem: find a portable way to determine whether a compiler supports the "long long" type of C99. I thought I had this one solved with the following code: #include <limits.h> #ifdef ULONG_LONG_MAX

Hi, I am trying to get as much information on void pointers. How do we take help of void pointers in writing generic functions. I have seen this kind of code for many years, but now I have got a chance to write some myself. Could anybody point me to a link where I can get more info for the same, or refer me a book having more detail...

This is probably an easy question, but I have not used C for quite some time: How do I determine the size of an array? More specifically, how do I determine the number of incoming parameters? Thanks. T

Hi guys, I am having to figure out the recusion in this function. int recfn(int v) { if(v==1 || v==0) return 1; if(v%2==0) return recfn(v/2)+2;

Hello, Unlike in pre-C99 versions of C where variables can only be defined at the beginning of blocks, C99 allows variables to be defined in arbitrary places inside blocks. However, gcc 3.2.2 seems to reveal that there are still places where this is illegal. For instance, consider the following code snippet. int main(void) { int i = 0;

When I'm reading from or writing to a network socket, I want to use a struct to represent the structured data, but must use an unsigned char buffer for the call to sendto() or recvfrom(). I have two questions: 1. Is it generally safe to "overlay" the structure on the buffer, e.g.: unsigned char buffer;