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13 Posted Topics
 | Hi, I recently placed about 3 GB worth of my university files on a USB drive. After a few days, I tried to access the files on the USB. So, I opened the 'My computer' folder, which is when I noticed that the removable drive showed '164 MB of 3.93 …  |
| | I don't quite understand the motivations behind the different forms of examination systems. For instance, in the UK, the GCSE and A level exams are held nationally by a set of examination boards. However, things are different here in the US. Exams till 12th grade are done locally. What is … |
| | I'm wondering why lecturers at university select the problems they select in the problem sets? I don't understand why those problems have to be selected and not any others.  |
| | I am an undergraduate student and. I have been facing a difficulty with my studies for quite some time. I hope you wouldn't mind sparing a few minutes to advise me on this matter. The problem is that whenever I read my lecture notes or a textbook or a labscript, …  |
| | Let's say you have made a class called threevector which takes stores three doubles. Then you define another class, a fourvector, which stores four doubles. I have seen this syntax used for the constructor of the fourvector: [CODE]fourvector(double fourth, threevector one_two_three): threevector (one_two_three) { fourth = 0.0; }[/CODE] I understand … |
| | Hi, I don't understand the need for the while statement. Any help would be greatly appreciated. [CODE]double michel() { double x, y; do // The loop computes points on the graph of y against x. { x = 53.0*rand()/RAND_MAX; // x is the momentum. x is randomly generated. Min x … |
| | Hi, if I run the following code and press L on the screen, I should be getting a leapfrog.txt textfile. But I only see my previous euler.txt. What is wrong with the code. Thanks in advance for any help. [CODE]#include <iostream> #include <fstream> #include <cmath> #include "H:\Visual Studio 2008\Projects\section2\threevector.h" using … |
| | Hi, I am getting an error message when using base classes. The error message is x: undeclared identifier y: undeclared identifier z: undeclared identifier The particle class derives from the fourvector class which derives from the threevector class, as follows. [CODE]#ifndef THREEVECTOR_H // Prevents the class being re-defined #define THREEVECTOR_H … |
| | Any method (within a C++ class) that prints to a file or to a screen has a return type of void. What role does the keyword [I]void[/I] perform?  |
| | Compiling the following the class in the main program returns error C2784. What could be causing the problem? [CODE]#include <iostream> // Include input/output stream #include <cmath> class threevector { public: double xcoord, ycoord, zcoord; // Default constructor threevector() { xcoord = 0.0; ycoord = 0.0; zcoord = 0.0; } // … |
| | I have seen the following in a abook: "The argument(s) of a method can be any type of object (as long as its class has been made available to the program), as well as the predeļ¬ned default types of variable. For example, methods in our three-vector class are not limited …  |
| | Hi, I have to calculate the exponetial of a large (on the order of 10^5) negative number. I tried using exp(), the exponential function from the cmath library, but I get an answer of 0. So, I tried to use the power series for the exponential function. For numbers from …  |
| | Hi, I am doing an undergraduate physics project by writing a C++ code to implement the Metropolis algorithm to a simple 2d one component plasma. In short, I have to determine the equilibrium configuration at each temperature by means of the Metropolis algorithm and then compute ensemble averages (such as … |
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