C++ :: 2 Dimensional Vector Represented As A Class
Nov 5, 2014
I have to create a class to represent a 2 dimensional vector. I need to include certain member functions such as a function to find magnitude of the vector, and one to find the dot product of that vector with another vector, and several others too. That's all fine. A stipulation of the problem is that I must include a constructor which can take cartesian form of the vector and a constructor which can take polar form of vector. Since this involves overloading the constructor the best solution I have come up with is to create the object with either doubles or floats so that the compiler can choose the correct constructor. This seems like a really bad idea. Is there a way I can get the compiler to choose the correct constructor without doing it using the precision? Here is a sample of my header file, there are many more member functions
class Vector{
public:
Vector(double x, double y, double v, double w){
myArray[0]=x;
myArray[1]=y;
additionalArray[0]=v;
additionalArray[1]=w;
[Code] .....
In my .cpp file the object is created with either four doubles or four floats depending on which constructor I want to implement. There must be a better way. Additional Array is created for use in member function which require calculations with a second 2d vector.
Suppose I have a two-dimensional stl vector (a vector of vectors), for example:
Code : vector<vector<int> > x;
And then I want to sort the outer vectors in order of the size of their inner vectors. How do I do this?
Usually, with a one-dimensional vector, I can just create a comparison function and use the sort function. For example, if my vector is defined as:
Code: vector<int> y;
And I want to sort if in terms of the int values of each vector element, then I can sort by using the stl::sort function, with the comparison function defined as:
I am using 2 ARRAYS OF DIFFERENT SIZES in One 2-Dimensional Vector, and my output is not correct. The arrays are size 4 and size 13.
I want COLUMN 0 to have: 55, 66, 77, 88.
I want COLUMNs 1-12 to have 1,2,3,4,5,6,7,8,9,10,10,10,11 in EACH ROW. It would seem that the 2nd loop for the size 13 array would need to loop 4 times in order to fill 4 rows, however, I'm not sure how to do that. Here is what I have so far in code and output:
#include <iostream> #include <vector> using namespace std; int main() { int typeArray[4] = {55,66,77,88}; int valArray[13] = {1,2,3,4,5,6,7,8,9,10,10,10,11};
Two Hard-coded Arrays into One 2-Dimensional Vector I have 2 arrays, each of them are hard-coded with integer values. I also have one 2-Dimensional vector and I want to put 1 array into the first column of the vector and the other array into the 2nd column of the vector. The reason is that I want to do math on the 2nd column of the vector only.
I am able to accomplish this with 3 arrays. Two of them are 1-Dimensional and the third array is 2-Dimensional.
I need to make a small program with a function with this prototype: void f(char *a,char *b) that adds two numbers represented as strings without using conversion operators or other tricks.
If I have a number 117, represented in binary as : 01110101 and I wanted to grab the top nibble. What would be the decimal value I would be extracting?
Would it be 0111 or 0101 decimal values 112 or 5 or is my understanding completely wrong?
The following function finds the normal to a terrain represented by a texture. I found it somewhere online , it works but i couldn't understand the math behind it. So , How (or Why ?) does it works ?
//psuedo code Vector2 normal(x,y) { Vector2 avg; for(int w = -3; w <= 3; w++) { for(int h = -3; h <= 3; h++)
How can I concatenate two 2-dimensional int arrays into one larger 3-dimensional array. This question is also valid for the 3-dimensional vectors. I know the command for the one dimensional vector as:
I had a hard question in my C++ final exam and I'm trying to solve it for the last 3 days. I haven't succeded yet! Here is the question: You have a one-dimensional array A[20]={1,2,3,4,...,20} and B[5][4] you have to assign the A array's elements to the B array but there is an order which is: B[5][4] = { { 12, 9, 11, 10 }, { 14, 7, 13, 8 }, { 16, 5, 15, 6 }, { 18, 3, 17, 4 }, { 20, 1, 19, 2 } } and there is a restriction: you can only use ONE for statement, nothing else!
#include <iostream> #include <iomanip> using namespace std; int main(){ int A[20] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }; // define A array's elements. int B[5][4] = { 0 }, k = 1; // define B array and k counter.
[code]....
I can't narrow the statements to one,This program works perfectly but it shouldn't be that long, we need ONLY ONE FOR statement, not two!
I have a settings class and a settingItem class. The settings class has a vector of settingItems. The vector is not working:
error C2065: 'settingItem' : undeclared identifier error C2923: 'std::vector' : 'settingItem' is not a valid template type argument for parameter '_Ty'
Okay so I have a class Student, which takes a number and a vector as a parameter for the constructor. Everything works well, until I output the values of the vector for every instance. The problem is that the same vector is being shared with EVERY instance I create, but I want it to be unique for every single one!
What I want to do with the below code is to construct the vector containing 'Ability' objects in the class 'Card'. I have searched for the solution in the past, and have been unsuccessful, mainly because the vector contains child classes of the parent class 'Ability'. The below code is a snippet of the larger program that I am working on, and should compile:
As you can see, in the class 'Card' I have a pretty large constructor. Up to this point, however, I have failed in my attempts to construct the abilities vector, because it contains those child classes.
For a beginners C++ lab, I have a base class Employee and two derived classes HourlyEmployee and SalaryEmployee. In main, I have a vector defined as vector <Employee *> VEmp; It's then passed to a function to get the input, which works fine. But what I'm struggling with is another function with the header "printList(const vector <Employee *> & Ve)". It's supposed to loop through the vector and call the appropriate printPay function, which is a seperate print function inside each derived class. How do I loop through the vector and print it out? I was trying to do a for loop and something like "Ve[i].printPay();", but that doesn't work. So how would I do it?
Here's some snippets of the relevant code.
class Employee { .... virtual void printPay() = 0; }; class HourlyEmployee : public Employee {
I need to create a vector of pointers and hold the book objects in it. then i have a virtual function in my books which is a pure virtual in LibraryItems. When i try to add the books object in my code, i understand that since the scope runs out there is no object that is added. so when i run print it gives me an error.
#include<iostream> #include "books.h" #include "library.h" #include <vector> using namespace std;
int main(int argc, char * argv[]) { vector<LibraryItems* >libraryInfo;
I get a problem with the vector as a private class member: When I did't initialize the vector in constructor(which means the size of the vector would be 0), I used a class function to add two elements to the vector and it worked (because I added a "printf" to output the size of the vector and the elements within that function). However, when I used another class function to visit that vector, no element was in and the size became 0.
Then I tried to add two elements to the vector during the construction, and it turned out that these two elements could be stored in the vector while other elements added through class functions could not.
I guess there may be some problems on the scope of the function. But I feel the class member should not be effected by the scope of the class function.
