Basically I have to combine names and values into one vector. How do I do that? Then, how would I pull them both out as two separate parts in order to display (names,values) on the screen?
Code done in TextPad
@d declare variables
@{
vector<string> names;
[Code].....
I've been working on a project where we are to take a file with lines of strings, and rewrite it with the same values in integers. I've tried it two different ways. The first way resulted in an infinite loop when it tries to put the data into an array (the first while loop):
Code:
#include <stdio.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
[code]....
1. Write a c++ program to create a vector of integers. copy the vector contents into list, sort the contents, then copy selected items into another vector(like elements less than 10 etc)
View 1 Replies View RelatedMy function has the following prototype:
std::vector<double> calculate_mag_response(double start_freq, double end_freq,
int N, std::vector<double> num, std::vector<double> den
The function should return a vector size N of magnitude responses in decibels of the transfer function defined by numerator and denominator vectors num and den. To adequately test, you should drive this with more transfer functions.
#include <vector>
#include <iostream>
#include <cstdlib>
#include <ifstream>
using namespace std;
int main(int argc,char *argv[]) {
vector<double> myNum, myDen, results;
[Code] ....
Program is supposed to check for balanced parentheses which are (), {}, [] using a vector First read in the number of lines user wishes to testReturn Yes if balanced, No if unbalanced. Missing conditions to check for unbalanced parentheses Program doesn't catch left parentheses returns YesPairs wrong parentheses together, (} returns Yes, should be No Cases with incorrect output (}, (], ))), }}}, ]]], just a space or nothing entered. how I can correctly catch the cases I've missed
Code:
#include <stdio.h>
#include <stdlib.h>
#include "char_vector.h"
int main( int argc, char * argv []) {
int i, num;
char c;
scanf("%d", &num);
scanf("%c", &c);
[Code]...
I'm trying to get my program to read a series of comma delimited values from a file into a vector. However, I am unsure how to actually go about doing this. I've posted my best guess below but it's really just a stab in the dark and I always receive a compiler error.
Code:
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;
vector <string> v_input;
int main() {
ofstream fout ("Insert File Path Here.txt");
fout << "4, 8, 15, 16, 23, 42";
[Code] ....
How to output vector contents using the push_back function. My program reads in values just fine, but it does not output anything and I've been stuck on why.
here is my code:
#include <iostream>
#include <array>
#include <vector>
using namespace std;
int duplicate( vector < int > &vector1, const int value, const int counter)
[Code].....
I have a cpp app that reads in a number of files and writes revised output. The app doesn't seem to be able to open a file with a ' in the file name, such as,
N,N'-dimethylethylenediamine.mol
This is the function that opens the file :
Code:
// opens mol file, reads in rows to string vector and returns vector
vector<string> get_mol_file(string& filePath) {
vector<string> mol_file;
string new_mol_line;
// create an input stream and open the mol file
ifstream read_mol_input;
read_mol_input.open( filePath.c_str() );
[Code] ....
The path to the file is passed as a cpp string and the c version is used to open the file. Do I need to handle this as a special case? It is possible that there could be " as well, parenthesis, etc.
I need to create a class vector as a template and define operations on vectors.
And this is what I made.
#include<iostream>
using namespace std;
template<class T>
[Code].....
Lets say that I have a vector of vector of integers. <1,2,3,4> , <5,6,7,8>, <10,11,12,13>
How do I make a function that creates vector of vector of every different integers?
<1,5,10> , <1,5,11>, <1,5,12>, <1,5,13>
<1,6,10> , <1,6,11>, <1,6,12>, <1,6,13>
<1,7,10> , <1,7,11>, <1,7,12>, <1,7,13>
<1,8,10>, <1,8,11>, <1,8,12>, <1,8, 13>
<2,5,10>, <2,5,11>, <2,5,12>, <2,5,13>
and so on...
I get so close, and then it seems my brain shuts down ... I need to write a program that outputs a histogram of student grades for an assignment. The program should input each student's grade as an integer and store the grade in a vector. Grades should be entered until the user enters -1 for a grade. The program should then scan through the vector and compute the histogram. In computing the histogram, the minimum value for a grade is 0, but your program should determine the maximum value entered by the user. Use a dynamic array to store the histogram. Output the histogram to the console. For example, if the input is:
20
30
4
20
30
30
-1
Then the output should be:
Number of 4’s: 1
Number of 20’s: 2
Number of 30’s: 3
I can't quite get my output to look like that:
/* This program will display the histogram of student grades for an assignment */
#include <iostream>
#include <vector>
#include <stdlib.h>
#include <conio.h>
[code]......
This is my code: [tag]
Code:
#include <iostream>
#include <string>
#include <cstring>
#include <vector>
using namespace std;
[Code] .....
I have asked a related question before, and it was resolved successfully. In the past, when I wanted to use std::max_element in order to find the maximum element (or even sort by using std::sort) of a vector of structures according to one of the members of the structure, all I had to do was to insert a specially designed comparison function as the third argument of the function std::max::element. But the latter comparison function naturally accepts two arguments internally.
For instance, here is a test program that successfully finds the maximum according to just one member of the structure:
Code:
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
[Code] ....
And the output was this, as expected:
Maximum element S.a of vector<S> vec is at: 9
[I]max element of vec.a between slot 3 and slot 6 is: 6, and its index is: 6 vec[6].a = 6
[I]max element of vec.a between slot 4 and slot 7 is: 7, and its index is: 7 vec[7].a = 7
[I]max element of vec.a between slot 5 and slot 8 is: 8, and its index is: 8 vec[8].a = 8
[I]max element of vec.a between slot 6 and slot 9 is: 9, and its index is: 9 vec[9].a = 9
However, I now need to search and find an element of vector<myStruct> according to just one member of myStruct, instead of finding the maximum or sorting as before. This presents a problem because the function std::find does not accept such a comparison function as its third argument.
This was the description of the std::find function that I found: find - C++ Reference
Code:
template <class InputIterator, class T> InputIterator find (InputIterator first, InputIterator last, const T& val);
I could also find another function called std::find_if, but this only accepts a unary predicate like this: find_if - C++ Reference
Code:
template <class InputIterator, class UnaryPredicate> InputIterator find_if (InputIterator first, InputIterator last, UnaryPredicate pred);
And once again this is either inadequate of I don't see how to use it directly, because for the third argument I would like to insert a function that takes two arguments with a syntax like this:
Code:
int x=7;
std::vector<S>::iterator result;
result = std::find(vec.begin(), vec.end(), []( const (int x, const S & S_1) { return ( x == S_1.a ) ; } ) ;
Is there another std function that I can use to make search and find an element according to just one member of myStruct?
Or perhaps there is a clever way to pass two arguments to the unary predicate.
I am trying to print a matrix solution that I've stored in a vector of doubles. The original matrix was stored in a vector of vector of doubles. I want to print to the screen and an output file. Right now it just prints to screen column-style and the output file is horizontal-style. I tried to change the solution from vector of doubles to a vector of vector of doubles like the original matrix but when I run my code it crashes. Here is what I am referring to:
void readMatrix(vector<vector<double>> &matrix, vector<double> &b, int &N, string input) {
ifstream in(input);
in >> N;
matrix.resize(N);
b.resize(N);
[Code] ....
However when I change my printResult function to this (I removed the string argument because I just want to get it working to the screen first):
void printResult(vector<vector<double>> &sol, const int N) {
//ofstream out(output);
//int j;
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++){
[Code] ....
The program crashes. Am I even printing the matrix correctly?
I want to have it so that when i ask for the person witch item they want to drop on the ground it goes into another vector that i can pick back up the item if they want it back and erase when they walk away.
#include "stdafx.h"
#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <cmath>
using namespace std;
struct InventoryItem
[Code] ....
Code:
#include <iostream>
#include <istream>
#include <fstream>
#include <vector>
[Code]....
Why is it reading in nothing for the arrays, and also making the size of the total thing the total number of numbers? It should have a size of 2, not 5.
I am trying to copy vector to vector as follow:
Code:
std::vector<unsigned char> vec1;
//insert some values into vec1
std::vector<unsigned char> vec2;
Now I want to to copy 2 bytes from vec1 starting at index 5., why do i need to know how many bytes from the end of vec1?? can't i just specify how many bytes i want to copy from starting index?
std::copy(vec1.begin()+5, vec1.end()-??, vec2.begin());
Code:
#include <iostream>
#include <vector>
int main() {
std::vector<std::vector<double> > DV; //2d vector
std::vector<double>temp(8,0.0); //1d vector
[Code] .....
The conversion actually works but it does not give the expected the result. The output should be:
Code:
1 2 3
4 5 6
7 8
and it outputs:
Code:
123123123
What is another name for a Vector inside of a Vector. What is the name of this construct? Would it be a Constructor Vector? I think this is a trick question my teacher is asking...
View 4 Replies View RelatedSimple rect collision detection
bool check_collision(SDL_Rect *box1, SDL_Rect *box2){
if(box1->x+box1->w<=box2->x)return false;
if(box1->x>=box2->x+box2->w)return false;
if(box1->y+box1->h<=box2->y)return false;
if(box1->y>=box2->y+box2->h)return false;
return true;
[Code] ...
The order of the game is of course standard.
1.handle input
2. handle logic
3. render
4. update
It's all pretty simple and straight forward, but oftentimes (not always) when the weapon hits the asteroid, the program crashes. If for example I turn off the delete main_weapon[i] and main_weapon.erase(main_weapon.begin()+i); the program works perfectly, but of course the bullets go right though the asteroid object, which is not what I want. It's only the weapon deletion which is causing no end of trouble.
I am writing a c++ program which uses a vector which contains rows and columns of a table.Unfortunately I got the following error:
IntelliSense: no instance of overloaded function "std::vector<_Ty, _Alloc>::push_back [with _Ty=CCellDescr *, _Alloc=std::allocator<CCellDescr *>]" matches the argument list
argument types are: (const CCellDescr)
object type is: std::vector<CCellDescr *, std::allocator<CCellDescr *>>Here`s the code:
#include<iostream>
#include<fstream>
#include<vector>
#include<string>
#include<iterator>
using namespace std;
[code].....
how to use 2D vector instead of 2D arrays?
View 1 Replies View Relatedbtw this is a part of my program
void query::load_query(const char* filename){
string lines;
int count = 0;
ifstream file (filename);
//READ OPERATION--ONE EXECUTION ONLY
if(file.is_open()) {
[Code]...
the 'flds' on the code above has vector <string> data type, i was able to output it using cout but i don't know how to copy its value to another vector <string>...whenever i tried to do that using my own way, the compiled program ended up crashing...
I rote this code in my program
JSONNode::const_iterator iter = root.begin();
for (; iter!=root.end(); ++iter) {
const JSONNode& arrayNode = *iter;
std::string type = arrayNode["type"].as_string();
if(type == "node")
[code]......
But when i try to ptint id of second item std::cout<<"Item Id ->>>>>>>>>>>>>" << collection[2].GetId() << std::endl; it gets a blank value. but size of the collection is 82, get the correct value for the collection size.
for example, I defined an empty 2D vector
vector<vector<size_t> > PI;
now I want to expand this 2D vector to Nx rows and Ny columns one by one and assign different value for each;
How can I do this? using push_back()?
My problem is that I have two classes that both need members from each other, so I need to use forward declaration + pointers, etc. However, trying to access a vector from a pointer throws an error.
Here's the code:
for(int j = 0; j < level->GetCollisionObjects().size(); j++){
if(fr.intersects(level->GetCollisionObjects()[j])){
rotate = false;
}
}
level is a pointer to class Level. This function is inside class GamePiece. Class Level includes class GamePiece, but GamePiece needs access to the vector CollisionObjects. This function throws a vector size error, and I'm totally lost on what to do.