C++ :: Deriving A Class From Vectors
Jul 13, 2012
i want to derive a class named population which is derived from vectors of solution and solution class is derived from vectors of int. That means that population is collection of solutions and is created with vector by deriving it from template based vectors<solution>. my question is that I am a bit confused in this hierarchy and not getting idea of constructors and destructors and calling mechanism of methods. I do have concepts of inheritance and constructors in inheritance but confused in this perspective.
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Feb 4, 2014
So I have a base class, lets call it base. In base I have a virtual function called update(), update just couts "base" then I have a class derived from base called derived;
it has a function called update(), update just couts "derived" then I create a vector called Vec it's initialised like this:
std::vector<base> Vec;
then I add an element into it like this
Derived DerElement;
Vec.push_back(DerElement);
then when I type:
for (int i=0; i<Vec.size(); i++) {
Vec.at(i).Update();
}
It outputs:
Derived DerElement2;
DerElement2.Update();
and it outputs this:
#include <iostream>
#include <vector>
class Base {
public:
virtual void Update() {
[Code] .....
and this is it's output:
Base
Derived
Press any key to continue . . .
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Jul 23, 2012
I have implemented matrix class using vectors. code is
template <class T>
class CBSMatrix : public CBSVector< CBSVector<T> >
CBSMatrix(long r,long c, T t) {
setsize(r, c);
init(t);
[Code] .....
Although i have implemented the cols() but things in it are confusing me specially this line "if(size()) return at(0).size();" and "CBSVector<T> v(cols());" this line in add row function is also troubling me. in main i have done some thing lyk CBSMatrix <int> mat(5,5,0); now how to put values in this matrix. How to put values in this template based and vector based wired matrix because first row is created in this and then cols are added to that row.
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Aug 4, 2013
#include <iostream>
#include <vector>
#include <string>
#include <map>
using namespace std;
struct bop {
string realname; //real name
[Code] ....
Okay, so first thing's first. The program will not compile due to lines 39-45. If I were to change those pointers into regular objects, it will not change the values of my class object. So what is the right way to do this?
I want the user to be able to input the # of employers/programmers into the system. But I cannot do that with an array of classes because when declaring an array; the array size must be constant.
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Mar 19, 2014
I create a list of vectors (a vector of n vectors of m elements).
std::vector <std::vector <int> > vsFA (n, std::vector<int>(n));
How I assign values? I try below, but not worked
void armazenaFA( std::vector <int> &vFA) // this function only knows about vFA
{ vsFA[n] [m]= simTime().dbl();
OR
vsFA[n].push_back(simTime().dbl());
}
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Sep 19, 2014
This is probably a very basic question, but I need to create two vectors and then loop through the vectors and output each pair that is found.
The user will input min1 and max1 with step1 for the first vector and min2 and max2 and step2 for the second vector. Then the loops will go through and return the combinations will return each pair of the two vectors.
So if I input min1=1 and max1=10 and step1=1 and same for vector two the return would be:
[1,1]
[1,2]
.
.
.
[10,10]
This is for part of a homework assignment, but I can't continue on the assignment without first getting this simple part to work.
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Mar 27, 2013
I want to add 2 vectors to print out so that there on the same line. What I am trying to make is an inventory system that will use 2 vectors to keep the pounds of the item and list the 2 vectors on one line.
(I am using Microsoft Visual C++ 2010 Express)
Like this:
0. empty 0
1. empty 0
2. empty 0
etc...
Right now it looks like this:
0. empty
0. 0
The code:
#include "stdafx.h"
#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <cmath>
using namespace std;
int main() {
vector<string> inv;
[Code] ....
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Apr 19, 2012
I have a vector I want to add book titles to, then i want to print my updated vector. This is best I have come up with but the program fails at the getline line. why?
string book;
cout << "Enter book to add: "<< endl;
getline(cin, book);
books.push_back(book);
for(int i = 0; i < books.size(); ++i) {
cout << i+1 << ". " << books[i] << endl;
}
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Feb 20, 2014
My question is not in c++ programing , but because my aim is to make code that calculate the three angles between two vector i ask my question here
So as the title i have three point that create two vector and I want to get the angles in x,y and z of the point2
I used crosproduct that give me one angle without axe , I don't know in which axe this angle
My aim is the three angles for the 3 axes ....
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Mar 25, 2014
I can't figure out the error in this code; it compiles but returns rubbish.
serge
#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
[Code] ......
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Dec 28, 2013
I try to use quaternion to rotate one(and later more!) 3d-vectors in a general manner.
i read in wikipedia, that the general calculation goes with:
vector_rot = quaternion * vector * quaternion_compl.conj.
I used the class of irrlicht [URL] .... to do the calculations.
there is no premade function in this class to rotate vectors through this quaternions, so i just tried to it this way:
irr::core::vector3df v1(1,0,0);
irr::core::quaternion a1(2,3,4,6);
a1.normalize();
irr::core::vector3df result2(a1.X*v1.X*(-a1.X),a1.Y*v1.Y*(- a1.Y),a1.Z*v1.Z*(-a1.Z));
result2 should then be the rotated vector, but it does not work. i dont know how to explicitely write down the rotation specification in this topic.
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Apr 19, 2013
I'm trying to make it like a game. You would fire your gun, then have the option of reloading. If you run out of ammo and try to fire...it will automatically come out of your cache. Anyone who played a 3rd or first person shooter knows what I mean. I thought vectors would be the best course of actions since they can remove and add elements with ease. One of the many problems I have is subtracting the Hand Guns current ammo (size) from its maximum (capacity) to see how much to A. push_back into the clip and B. pop_back out of the cache. Can size() and capacity even be subtracted? Here's the code with what I believe to be all the possibilities.
#include<iostream>
#include<vector>
using namespace std;
int main(int argc,char** argv) {
vector<int> HG_cache (36,1);
vector<int> HG_clip (12,1);
char user_input;
[code]....
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May 19, 2013
The following code works perfectly with "normal" C++
#include <iostream>
#include <vector>
int main() {
std::vector <std::string> hello {
[Code] ....
This prints "HELLO" on the screen. A function a bit more like NCurses is:
for (std::vector <std::string>::const_iterator it = hello.begin(); it != hello.end(); it++) {
std::string temp = *it;
std::cout << temp.c_str() << std::endl;
}
This still works with "normal" C++. Now, how do I get this working with NCurses? I tried
#include <curses.h>
#include <string>
#include <vector>
int main() {
initscr();
[Code] ....
But this just gives me an empty screen.
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Mar 8, 2013
This is possibly more of an algorithm question rather than c++ related.Suppose I have two vectors:
std::vector<double> first = {1.0,2.01,3.05,4.05};
std::vector<double> second = {1,2,3,3,4}; // very similar except no decimals and a second "3"
And now I want an algorithm that will tell me how similar these two vectors are. That is, I want to know how much of first is similar to second.
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Jul 31, 2013
I am trying to use push back in a 2D vector but I don't know how to. This is what I have:
vector <vector <BigInt> > matr;
for (BigInt i=0;i<rij;i++) {
for (BigInt j=0;j<kolom-1;j++) {
matr.push_back().push_back((i+1)^(pow-j));
}
}
I quickly invented something but that doesn't work obviously. it should be equivalent to this: (the only problem in the code below is that those indexes don't exist yet that's why I need push_back())
for (BigInt i=0;i<rij;i++) {
for (BigInt j=0;j<kolom-1;j++) {
matr[int(i)][int(j)]=(i+1)^(pow-j);
}
}
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Nov 6, 2013
I my code i have a base struct ...
Then others structs made ...
struct base{};
struct a1 : base {
int a;
int b;
[Code] ....
Now i must deposit all these containers(maybe & of containers) in another vector...
How i can do that? Can i write
vector<vector<base*> > all;
all.push_back(&v1);
all.push_back(&v2);
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Dec 9, 2013
I have a vector of vectors declared as:
vector<vector<int>> v;
My program works fine with a small number of insertions to v. However, with a huge number of insertions my program stops working without telling me the reason... I guess that vectors might not grow after a certain size (im not sure)
1. What is the maximum size that a vector of vectors can grow?
2. I'm using Microsoft visual studio 2012, Is their anything I can do with the settings to increase the size of my vector? something beyond 1000000 rows?
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Sep 28, 2013
I've seen code examples for assigning 2 dimensional vectors, but I haven't seen code for assigning more than that. I tried to create a 3 dimensional vector, and the only code the IDE didn't complain about was
int x = 2;
int y = 2;
int z = 2;
vector < vector < vector <string> > >stringvec;
stringvec.assign(x, vector <string>(y), vector <string>(z));
Would this be the correct way of producting a vector[2][2][2]?
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Sep 4, 2014
I have a doubt and I have two vectors to a function.
A vector is (int *, const int) and the other is (string *, const int) and want to spend the two vectors and unite in a single function
A vector is passed to a function, but spending two vectors and join I cannot find the turn.
try (int *, const int, string *, const int)
But only understands the former as I do
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Oct 13, 2014
I have a CSV file that is formatted in the following way. The top row contains headers and the data is below. I have opened the file (sec2011) in Numbers on Mac and saved it as a csv. I would like to read each of the columns into a vector, but I can not get the code to even open the file.
secid,date,low,high,close,volume,return,cfadj,open,cfret,shrout
101310,03JAN2011,181.21,186,184.22,5331413,0.023444,12,181.37,12,448837
101310,04JAN2011,183.78,187.6995,185.01,5033144,0.004288,12,186.15,12,448837
ifstream infile("sec2011.csv");
if (!infile) {
cerr << "Couldn't open file!"<<endl;
return 1;
This code always returns the Couldn't open File text.
What am I doing wrong. I know the above code doesn't put the data into vectors, but I can't even get the file to read.
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Jan 15, 2013
I'm trying to solve Project Euler 16 where you have to calculate 2^1000. SO I made a program that would solve multiplying a number b a single digit factor through manual multiplication in a vector, just to test things out.
The problem is when I take things out of main and try to make a separate function, the original number is never multiplied.
Here's my code with functions...
/*Using vectors manually to multiply a number to a positive power.*/
#include <iostream>
#include <vector>
using namespace std;
void print_vector(const vector<int>& v);
[code]....
Here is the other code, not using functions but even if I use an extra for loop to multiply by the same factor several times, it still does the same thing.
/*Using vectors manually to multiply a number by two (or any single digit factor).*/
#include <iostream>
#include <vector>
using namespace std;
void print_vector(const vector<int>& v);
[code]....
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Jun 4, 2013
this time I have an ACTUAL polymorphic problem.
void func(std::vector< BaseClass* > A){}
std::vector< SubClass* > B;
func(B); //Compile error C2664
I get an error like so:
void func(std::vector< BaseClass* > *A){}
std::vector< SubClass* > B;
func(&B); //same error
The error is summarized here:[URL]
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Apr 30, 2013
How would you search through the a list of vectors? I have a upper case letter at the start of the lists and corresponding lower case letters in vectors how would I search through it to see how many times the corresponding lower case letter was repeated?
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Apr 16, 2015
I want to get ride off lists and vectors in this program i also don't want to use classes, just want to use strings functions and structures...
#include <iostream>
#include <string>
#include <list>
using namespace std;
struct contact {
string name;
int studentiD;
[Code] ....
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Oct 31, 2014
I am writing a brute force implementation of matrix multiplication:
Header file:
vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>;
Source file:
vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>{
int n = a.size();
vector< vector <int> > c (n , vector<int> (n));
for (int i =0 ; i<n ; i++){
for (int j =0 ; j < n ; j++){
for (int k ; k < n ; k++){
c[i][j] = a[i][k] + b[k][j];
[Code] ....
I keep on getting occasional seg faults />/>. I can't see why.
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Apr 19, 2012
I was given a project to program a library catalog. One of the aspects is that we have to allow an administrator to add, modify, and delete books from the catalog. It was recommended to me to use vectors. So I initialized by hand a default book list, and now I want to be able to have an adminisistrator add books and then print the modified book list. Here is what I have got:
main () {
char yesorno;
string bookname;
vector<string> books;
[Code].....
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