Topics by monkey_king

I'm having difficulties understanding and printing the max value of a size_t type. Apparantly the size_t is typedefed to a unsigned long int on my system. Is this safe to assume its the same on all c++ compilers? The 'sizeof' function returns the number of bytes(size char), used to represent …

Hi, Can someone elaborate why the following (the if conditional) differs [CODE=c] int main(){ const char *filename = "test.txt"; int ifd; if((ifd=open(filename,O_RDONLY))<3) err(EX_NOINPUT, "%s", filename); fprintf(stderr,"ifd is:%d\n",ifd); off_t bytes_in = lseek(ifd, (off_t)(-4), SEEK_END); return 0; } [/CODE] vs [CODE=c] int main(){ const char *filename = "test.txt"; int ifd; if(ifd=open(filename,O_RDONLY)<3) err(EX_NOINPUT, …

Hi I've found a strange problem on ubuntu64bit, that limits the data you are allowed to allocate on a 64bit platform using the c function 'read()' The following program wont allow to allocate more that 2.1gig memory. [CODE=c++] #include <stdio.h> #include <stdlib.h> #include <err.h> #include <fcntl.h> #include <sysexits.h> #include <unistd.h> …

If I simply just want to tokenize the first element of a string and then output the remainder of the string, how can this be accomplished? thanks [CODE=c] #include <stdio.h> #include <string.h> int main(){ const char* line= "0 firstline"; char* l = strdup(line); printf("beforeToknization:\t%s\n",l); char *tok = strtok(l," "); printf("firstToken:%s\trestOfLine:%s\n",tok,l); …

Hi I stumpled upon some c-code, which syntactically is different from what I've seen before. [LIST=1] [*]first [CODE=c] void strreverse(char* begin, char* end) { char aux; while(end>begin) aux=*end, *end--=*begin, *begin++=aux; } [/CODE] Would this be the same as [CODE=c] void strreverse(char* begin, char* end) { char aux; while(end>begin){ aux=*end; *end--=*begin; …

I'm trying to get myself acquainted with memory allocation and deallocation while writing a program that will actually be usefull for me. The program is a simple datareader, that tries to read a matrix from file. The "main" program which works is 'int get_lex(char *in,char *delims,char ***returnvals)' This will essential …

I've been overloading some methods for a template class. This means I can write my code in this way. [CODE=c++] myClass var3=var2+4; [/CODE] Is it possible to do it the otherway around like [CODE=c++] myClass var3=4+var2; [/CODE] I know that the end result will be the same, I was just …

Hi I'm doing a templated matrix class, and I'd like to be able to pass a function pointer to a function that uses the rows. [CODE=c++] template<typename T> T sum(Array<T> &a){ // a simple function that return the sum of an Array T res=0; for(int i=0;i<a.length();i++) res+=a(i); return res; } …

Hi I'm doing a statistical mcmc model where I need some random numbers. I decided to use the ranrot-w generator. The random number only works when I call the randomnumber method directly, and not when i give the random number as an parameter to another function. that is rg.Random() !=random(rg) …