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• CS Concentrations and Career Paths

  - by xbonez

  I'm approaching the end of Sophomore year in college (Studying Computer Science), and very soon I'm going to have to decide on my concentration, but I honestly don't know what each concentration means. I basically have two questions: 1. How much influence does your concentration have on your career path? For example, would a video game development…

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• Serving index.html from a subdirectory

  - by xbonez

  In my document root, I have to directories: home and foobar, both with their own index.html files. How can I set it up so that when someone visits my site at example.com, they see the contents on home/index.html? I tried using an index.php with a redirect in document root, as well as a .htaccess redirect, but both of them change the URL in the…

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• Boolean algebra simplification

  - by xbonez

  I need to reduce this boolean expression to its simplest form. Its given that the simplest form contains 3 terms and 7 literals. The expression is: x'yz + w'x'z + x'y + wxy + w'y'z We tried this in class, and even out recitation teacher could not figure it out. Any help would be appreciated.

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• Quick question about pointers

  - by xbonez

  So, I have this code fragment: int * iPtr ; int * jPtr ; int i = 5, k = 7; iPtr = &i; jPtr = iPtr ; I have just started learning about pointers, and need to get some doubts cleared. is jPtr now essentially also pointing at i? I know I can change the value of i by using *iPtr, but how can I change the value of the object being pointed to…

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• converting string to int in C++

  - by xbonez

  I am trying to convert a string I read in from a file to an int value so I can store it in an integer variable. This is what my code looks like: ifstream sin; sin.open("movie_output.txt"); string line; getline(sin,line); myMovie.setYear(atoi(line)); Over here, setYear is a mutator in the Movie class (myMovie is an object of Movie class) that…

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• A question on vectors, pointers and iterators

  - by xbonez

  Guys, I have a midterm examination tomorrow, and I was looking over the sample paper, and I'm not sure about this question. Any help would be appreciated. Let v be a vector<Thingie*>, so that each element v[i] contains a pointer to a Thingie. If p is a vector<Thingie*>::iterator, answer the following questions: what type is p?…

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• Checking for duplicates in a vector

  - by xbonez

  I have to check a vector for duplicates. What is the best way to approach this: I take the first element, compare it against all other elements in the vector. Then take the next element and do the same and so on. Is this the best way to do it, or is there a more efficient way to check for dups?

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• Swapping values using pointers

  - by xbonez

  I have this code fragment int i = 5; int k = 7; int * iPtr; int * jPtr; int * kPtr; iPtr = &i; kPtr = &k; I am required to swap i and k using the pointers. This is how I'm doing it: *jPtr = *kPtr ; *kPtr = *iPtr ; *iPtr = *jPtr ; Is this the best way to do it, or is there a better way?

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• C++ program to calculate large factorials

  - by xbonez

  How can I write a c++ program to calculate large factorials. Example, if I want to calculate (100!) / (99!), we know the answer is 100, but if i calculate the factorials of the numerator and denominator individually, both the numbers are gigantically large.

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• Binary Addition. Is it overflow?

  - by xbonez

  Binary values are in 2s Complement form. If I am to add 110001 (-15) and 101110 (-18), and the answer has to be stored in a 6-bit integer, is this an underflow/overflow.

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• C++. What is a subprogram and method?

  - by xbonez

  I have a CPP HW to be done. One question is: 1) Write a subprogram (not a method) void promptForMovie(Movie & myMovie) that ..... 2) Write a method void output(ostream & out); that .... My question is what exactly is a subprogram and a method? Which one of them means a function, and what does the other mean? Thank you

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• Why am I not getting correct result when I calculate exponent with ^ in C++?

  - by xbonez

  I am using Bode's formuala to calculate distance of nth planet from sun dist = (4 + 3*(2^(n-2)))/10 If I calculate the distance this way, I get the right values: dist[2] = ((4 + 3*1)/10.0) ; dist[3] = ((4 + 3*2)/10.0) ; dist[4] = ((4 + 3*4)/10.0) ; But doing it this way, gives me incorrect values: vector <double> dist(5); …

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• C++ detecting end of file

  - by xbonez

  I have a C++ program that is reading in info from a file, that stores info seperated by "$$$$". An example of how the file looks is: abc bcd $$$$ def $$$$ qwe gfh $$$$ How can I detect the file has ended, without using the eof() function? I have it set like this, getline(sin,temp) if (temp=="$$$$") { } After reading the last set of…

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• Some exam questions about C++ vectors and arrays...

  - by xbonez

  Hey guys, I have a CS exam tomorrow. Just want to get a few questions cleared up. Thanks a lot, and I really appreciate the help. Que 1. What are parallel vectors? Vectors of the same length that contain data that is meant to be processed together Vectors that are all of the same data type Vectors that are of the same length Any vector…

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• Selecting size of vector of vectors

  - by xbonez

  I have a class called Grid that declares a vector of vectors like this: typedef vector<int> row; typedef vector<row> myMatrix; myMatrix sudoku_; The constructor looks like this: grid::grid() : sudoku_(9,9) { } As you can see, the constructor is initializing it to be a 9x9 grid. How can I make it work so that the user…

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• C++ Vector of vectors is messing with me

  - by xbonez

  If I put this code in a .cpp file and run it, it runs just fine: #include <iostream> #include <vector> #include <string> using namespace std; typedef vector<int> row; typedef vector<row> myMatrix; void main() { //cout << endl << "test" << endl; myMatrix mat(2,2); …

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• C++ Vector of pointers

  - by xbonez

  For my latest CS homework, I am required to create a class called Movie which holds title, director, year, rating, actors etc. Then, I am required to read a file which contains a list of this info and store it in a vector of pointers to Movies. I am not sure what the last line means. Does it mean, I read the file, create…

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• [C++] Why am I not getting the same values?

  - by xbonez

  I am using Bode's formuala to calculate distance of nth planet from sun dist = (4 + 3*(2^(n-2)))/10 If I calculate the distance this way, I get the right values: dist[2] = ((4 + 3*1)/10.0) ; dist[3] = ((4 + 3*2)/10.0) ; dist[4] = ((4 + 3*4)/10.0) ; But doing it this way, gives me incorrect values: vector double>…

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• Running for loop depending on size of string vector

  - by xbonez

  I have made a string vector vector actor_; and then added elements in it using push_back. I now want to display all of them, for which I need to run a loop according to the number of elements in the vector. For that, I need to run the following loop: for (int i = 0; i < (int)actor_.size; i++) { } but this…

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• C++ Declaring an uninitialized variable without a null constructor

  - by xbonez

  Consider the DUPoint class, whose declaration appears below. Assume this code appears in a file named DUPoint.h: #include <string> class DUPoint { public: DUPoint (int x, int y); int getX () const; int getY () const; void setX (int x); void setY (int y); void print(); …

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• [C++] Simple inheritance question

  - by xbonez

  I was going over some sample questions for an upcoming test, and this question is totally confusing me. Any help would be appreciated. Consider the following code: class GraduateStudent : public Student { ... }; If the word "public" is omitted, GraduateStudent uses private inheritance, which means…

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• C++ Questions about vectors

  - by xbonez

  Hey guys, I have a CS exam tomorrow. Just want to get a few questions cleared up. Thanks a lot, and I really appreciate the help. Que 1. What are parallel vectors? Vectors of the same length that contain data that is meant to be processed together Vectors that are all of the same data type Vectors…

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• C++ Vector of vectors

  - by xbonez

  I have a class header file called Grid.h that contains the following 2 private data object: vector<int> column; vector<vector<int>> row; And a public method whose prototype in Grid.h is such: int getElement (unsigned int& col, unsigned int& row); The definition of…

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