I wud like to delete multiple values from a vector using indexes as my values r not fixed they may change so using indexes i want to delete
For example: vector<int> v={1,2,3,4,5};
I want to erase 3,4,0 indexes
So resulting vector is 2,3
This is my code: [tag]
Code:
#include <iostream>
#include <string>
#include <cstring>
#include <vector>
using namespace std;
[Code] .....
I would like to return multiple values from one function to access in different functions. For example:
int function1(//what goes here?)
{
int a ;
a = 1 + 2 ;
int b ;
b = 3 + 4 ;
return (what goes here if i want to return the value of a and/or b to use in another function?) ;
void function2()
{
//now i want to use the value of a here to use in an equation, how do i do that?
//now i want to use the value of b here to use in an equation, how do i do that?
}
I am working on a text based RPG. As with most RPGs the character has attributes that grant modifiers. Lets take strength for instance. Suppose the character can have a strength score that ranges from 1 to 10. Based on strength the modifiers could be like the following:
Strength = 1 grants +1 to hit and +1 damage
Strength = 2 grants +1 to hit and +2 damage
Strength = 3 grants +2 to hit and +3 damage
I want to set these values at design time and be able to retrieve the modifiers based on the strength value from multiple places in my program.
What is the best method of designing this. I looked around online and saw references to Lists with Tuples and Dictionaries with Tuples but these did not seem to be a very efficient way of handling the scenario above.
I'm trying to make a 2d shooter with SDL and I got as far as having multiple bullets but they act as one when a bullet goes off screen. I shoot 1st bullet, then I shoot 2nd bullet. 1st bullet goes off screen (deletes) and 2nd bullet disappears. I shoot 3rd bullet, 2nd bullet reappears where it disappeared and repeat.
class Bullet {
public:
static const int BULLET_WIDTH = 15;
static const int BULLET_HEIGHT = 25;
static const int BULLET_VEL = 5;
Bullet();
//xFire, yFire - position relative to player
[Code] ....
I'm guessing the problem is in the bullet_move function, but I just don't know what to do.
I used to use map to access elements. map has a good feature that it sort the element automatically. Now I need a map which can access element through multiple key values. So I choosed boost::multi_index_container. I defined a container as follows.
struct elem {
int a,b;
elem(int aa,int bb):a(aa),b(bb) {}
};
typedef multi_index_container <
[Code] ....
What I am wondering is whether boost::multi_index_container can sort elements automatically. Specifically, are all elements extracted through iterator from begin to end shown below having b values between 2 and 100?
test t;
test::iterator begin = t.lower_bound(make_tuple(1,2));
test::iterator end = t.upper_bound(make_tuple(1,100));
I need to pass multiple values from one function to another and how to do this. Here is my code so far.
#include <iostream>
#include <string>
#include <cctype>
#include <fstream>
using namespace std;
//Function Prototypes//
int charString(string, string, string);
string reverseString(string, string, string);
[Code]...
I basically need to take line1, line2, and line3 and return them to the reverseString function. Also, I am not allowed to do anything like make my own classes. I have to stick to the basics and no higher level programming techniques since we have not learned them yet.
How could I search a vector element with multiple strings
i.e. vector.at(i) = This is a test
How could I search that to look for the word "test" in that element?
I have a vector that I would like to access and work with from multiple threads. I have created an example below to illustrate the functionality that I would like to accomplish.
The goals are to be (1) high speed, (2) thread safe, and (3) *if possible* continue to use vectors as my larger project uses vectors all over the place and as such I would like to maintain that.
However, if I need to switch from vectors to something else then I am open to that as well.
The following example below compiles but crashes rather quickly because it is not thread safe.
How I can fix the example below which I can then apply to my larger project?
#include <string>
#include <vector>
#include <ctime>
#include <thread>
#include <iostream>
#include <random>
#include <atomic>
#include <algorithm>
enum EmployeeType {
[Code] ....
in a function how do you return multiple values to the main function.
View 4 Replies View RelatedSo I have to write a code for my C++ class, and I am having a problem trying to figure out how to get my code to read multiple int values. This is what my code should look like
Enter two times in military format (e.g., 1730 1520): 1730 1520
[1520<1730]
Enter two times in military format (e.g., 1730 1520): 1520 1730
[1520<1730]
Enter two times in military format (e.g., 1730 1520): 1730 1730
[1730==1730]
Enter two times in military format (e.g., 1730 1520): 1760 1520
1760: [INVALID TIME 1]
Enter two times in military format (e.g., 1730 1520): twelve 2
[INVALID NUMERIC INPUT]
I have an XML document, formatted as such:
<?xml version="1.0" encoding="UTF-8"?>
<Books>
<Bookmark Name="1984" Folder="C:UsersmillerDownloads1984 (George Orwell) - Audio Book" Time="00:43:58.4080000" Chapter="0" />
</Books>
Each Element named Bookmark has 4 attributes, Name, Folder, Time, and Chapter.
I'd like to be able to just put all of them in ONE type of container, without making multiple lists... Is there any way, using Linq to XML, to maybe add all of these values to a Tuple?
Two questions:
1. I have some vector<unsigned char> containing binary data. I would like to combine them into one std::string. How is the correct way to accomplish this?
This is my best guess for sample code:
Code:
vector<unsigned char> data; //conatins some data
vector<unsigned char> data2; //contains more data
string temp(data.begin(), data.end());
temp.append(data2.begin(), data2.end());
Will this code work with binary data, or will it null terminate?
2. A similar problem.. I have some unsigned char* variables, and I want to combine them into one std::string. How can I accomplish this? will the member append() work here? or will it null terminate? Something like:
Code:
unsigned char* data; //conatins some data
unsigned char* data2; //contains more data
string temp(reinterpret_cast<const char*>(data));
temp.append(string(reinterpret_cast<const char*>(data2)));
Will the above sample code work without null termination?
Well, I have a .txt file that contains, together with a few characters, columns of values that I want to save in different files like is written in the program (file 1, file2, file3 - a with x, b with y, c with z). BUT, I don't want the values from the lines with the saying "interpolated_vector" to be printed in any of the three files.
What I have is the code below, that has the code that creates the three new files with the columns of values that I want. It is working fine!
Code:
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
int i, count;
double *a, *b, *c;
double *x, *y, *z;
char tag[5][255];
[Code]...
I've tried and tried, but couldn't make it work properly. I could only erase one line with "interpolated_vector" using fgets, but all the other lines below this were printed into the three new files (file1, file2, file3).
vector<int> *vec; allocate memory and
suppose vec conatins 10 values then
erase(vec->begin(),vec->end());
vec.clear();
both should be used or any one one is fine to erase all ??
Code:
// string::erase
#include <iostream>
#include <string>
int main () {
std::string str ("This is an example sentence.");
std::cout << str << '
';
str.erase (10,8);
std::cout << str << '
';
Code:
Output:
I don't understand this program. What do these 2 numbers represent? The index of an element in a character array? The 10th character of the array is 'n' and 8th is a "space".
My question is on c++ strings. At the moment my program is reading input in one line at a time after the user presses enter.
I want to read multiple values in on a single line. Example: "apple banana orange end" ... How would I do this?
MAIN Code:
#include "Header.h"
#include "Orange.h"
#include <iostream>
#include <string>
#include <cctype>
using namespace std;
[Code] ......
So I have this text file that I am trying to read from and store the values of each line in multiple variables. Let's say my text file contains
AXSYZ3482 Tom 100 112 and my code below here works fine when the lines in the text file is separated by spaces.
Code:
while (fscanf(fp, "%s %s %d %d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
But let's say my file was to look like this instead.
AXSYZ3482:Tom:100:112
But if i try this below...
Code:
while (fscanf(fp, "%s:%s:%d:%d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
It seem to store the entire line in userID including the ":". I want to ignore the ":"'s and store everything in between in respective varibles in the order specified above.
So first string in userID, then ignore the :, then second string in name, and ignore the next :, and so forth.
How difficult would it be to program a hash-map system where each "key" can have multiple values under indexes?
For example: "Word" -> 45(index 0) , 67(index 1) , 12(index 2). What could I start with to program this or where could I find a pre-made system that does this?
So I have this text file that I am trying to read from and store the values of each line in multiple variables.
Let's say my text file contains
AXSYZ3482 Tom 100 112
and my code below here works fine when the lines in the text file is separated by spaces.
while (fscanf(fp, "%s %s %d %d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
But let's say my file was to look like this instead.
AXSYZ3482:Tom:100:112
But if i try this below...
while (fscanf(fp, "%s:%s:%d:%d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
It seem to store the entire line in userID including the ":". I want to ignore the ":"'s and store everything in between in respective varibles in the order specified above.
So first string in userID, then ignore the :, then second string in name, and ignore the next :, and so forth. How I can accomplish this?
I've a html table in my web form which contains 30 rows of textboxes. I want to display all the textbox values by using a search command...
View 1 Replies View RelatedSo in my winform form, I have a table layout panel and I attach Controls on the row. I make some control span multiple columns... But since I use transparent for the background of the layout panel, it show the border between 2 cells that I span.. Like this:
How do I erase the border in the middle of IDLabel?
I'm trying to use the find string to erase a ' ' from the end of a word. I tried something along the lines of:
if (SecondSide.find('
')!= string::npos)
SecondSide.erase(SecondSide.find('
'));
but it had no effect.
I want to add this piece of code to a project. I have created a vector from values entered by a user. I want to then subtract each value from each other from the beginning to the end. For example if a user enters 10,4,3 the program will subtract the values in that order 10 - 4 - 3 and output 3 as the solution. I figured how to do it with addition but can't get it to output for subtraction.
#include <iostream>
#include <vector>
using namespace std;
[Code].....
Why does this generate an error:
Code: std::copy( vec.begin( ) , vec.end( ) , std::ostream_iterator<double>( " " , std::cout ) ); whereas this works fine:
Code: std::copy( vec.begin( ) , vec.end( ) , std::ostream_iterator<double>( std::cout , " " ) ); I know I can use this instead:
Code: for ( std::vector<double>::iterator it1 = vec.begin( ); it1 != vec.end( ); ++it1 ) std::cout << " " << *it1;
I am trying to assign a list of values to a vector:
vector<string> words;
words[] = {"one", "two", "three"};
This does not work. How can I accomplish it?
