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Hi I am trying to overload << operator for a simple class class String { private: std::list<std::string> data; public: //some simple functions } ; Unfortunately my approach to overloading << doesn't work inline std::ostream& operator<<(std::ostream& os, const String...

I wrote a class "matrix" which uses **double. I am trying to write an operator [][] for this class to be able to perform f.ex matrix A; A[1][1]=2; Does anybody know how to overload such operator? Regards, Martin (OS and comp.) using Linux and gcc

Can somebody please tell me why the first code works and second not (of course the only difference is changing type of i var. from int to unsigned int) and maybe evaulate a solution how to change a first code using unsigned type and not receive an error. int a[3]; a[0]=0; a[1]=1; a[2]=2...

I am writing an application which is supposed to implement polynomials. It involves dynamic memory allocation, therefore I check it with valgrind. Once I noticed the following problem and I have no idea how to fix it double poly::operator() (const double& value) { double tmp; for(unsigned...

Hi I heart that for measuring a time of loop execution in nanoseconds struct timespec could be used. However, I didn't find any info how to implement it into C code. I am wondering if it works more or less the same as clock() function int s,f; float time; s=clock(); /*loop*/ f=clock()...

I am trying to write a program which is going to ask all users for password. It will be a console application. I am curius if there exists a function which can modify output of a console in such way: $./a.out $Enter password $******* /*We are entering f.ex tektips (7 letters) but on the screen...

I have got a problem with atoi function. From definition it converts string to intiger and as an argument it takes const char*. int atoi (const char *nPtr). If so why this code is wrong #include <stdio.h> #include <string.h> #include <stdlib.h> int main() { char *data; int i,r; data=malloc(10)...

I was trying to improve one of the programs from ANSI C (Kernighan's book) but I have encountered a very annoying problem and can't find out what's wrong. The idea of the program is to count words in a file in such a way: ==file example:== Hey teacher leave leave the kids alone alone ==result:==...

what does mean *(char* const*)random_name?? Is it a pointer to a pointer-to-a-pointer to char?