C++ :: Partial Tokenization From A Certain Position
Mar 14, 2013
I have a string like:
char *origin = "THIS, IS, SPARTA!"
What I want to do is get all characters in a string up to a certain delimiter, for that I've searched I can do that with:
sscanf
getline
strok
But what I don't know and haven't found is how to use these functions but to start reading from a certain position in the string. So I need to get the characters up to a comma but after "THIS," so that would be starting in position 5...
How could I do that? I tried using [x] in brackets but then it would just read a character...
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Nov 28, 2013
I have created a program which does tokenization to the whole line. The basic idea is if you have this ***HELLO%%SIR.
Then you have 8 tokens (2 words + 6 symbols). My algorithm is the following :
BEGIN OF THE LOOP
IF CHARACTER IS NOT AN ALPHABETIC LETTER
INCREASE THE COUNTER OF ITEMS ONE TIME
INCREASE THE COUNTER OF ARRAY ONE TIME
END IF
[Code] ....
And here is the implementation :
[C] C Words Tokenizer - Pastebin.com
First of all it is not an exercise from university. It is my reflection. What is your opinion about that exercise? It is useful? Tokens must be only the words between delimiters? I am analyzing the whole line.
Secondly I want to print the symbols and the words I don't want to use strtok to do this because I think that function line_tokenizer will not reusable due to strtok and the fact that puts the ' ' after the word each time it is called. (strtok) Is there any other idea in order to have the OUTPUT :
Code:
Give the sentence:
***HELLO%%SIR.
Analyzing...
The line has 8 token(s).
Symbols : ***%%.
Words : HELLO SIR
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Jul 5, 2014
I know there is strtok() to do the tokenization;but all strtok() examples I have seen only output one token at a time, moving the pointer ahead. Can't the tokens be saved somewhere?
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Mar 4, 2013
What I have to do is write a small program in C++ to parse the symbols that are used on 5 different lines of text in each position until position 30 is reached on each line. The goal of the parsing program is to interpret the symbols (characters), if there are any per each position, on the 5 lines of text in order to output the actual data that the group of symbols represents.
My question for is this: Is there anything special from a C++ environment that should go in to something like this outside of using standard stuff like the math associated with the search algorithm that has to happen here? The symbols are located in a file, so I know I have to include "iostream" and a few other headers. But outside of header inclusions and the code necessary to iterate and streamline the search and interpretation process, am I missing anything special that I couldn't otherwise find through simple google searches?
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Nov 20, 2013
I've been trying to create a templated class that takes a template as a parameter. I'd like to specialise this class for certain partial specializations of the template parameter but can't seem to figure out how to do it nor find anything online, (although I may be searching for the wrong thing).
As an example, say I have a class A that takes a template class with two parameters as its parameter:
template< template<class X, class Y> class Z > class A {};
I'd like to have a general version of A, for a general version of Z, but a specialisation of A for a specialisation of Z, e.g. where X is int but Y is still any type.
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Apr 25, 2013
Suppose I have this vector it contains dates example
Vector.Dates [slot 1][slot 2] [slot 3] etc...
anyways slot 1 contains [ 05282013]
slot 2 contains [07032015]
I want to split the data it contains into 3 other locations How do I do that???
like vector.1[05][07]
vector.2 [28][03]
vector.3[2013][2015]
How do you only take partial data from a vector slot?
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Nov 18, 2013
[URL]
#include <iostream>
#include <type_traits>
template<typename T, typename = void>
struct Test {
static int constexpr value = 1;
[Code] .....
Why does it output 1 instead of 2? How can I make it output 2 and still output 1 for e.g. Test<double>::value?
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May 15, 2013
I want to write a template that combines two type of resources:
class someClasses {
typedef someType ElementType;
} template<class T1,class T2>
class combo {
...
}
And I want to specify my T1 and T2 has the same ElementType, how can I write my combo class to partial specialize the general case so the ElementType check is at compile time?
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Nov 10, 2013
Calculated by the explicit scheme. Produces some very large numbers.
task:
[math] U_t = 3 (1,1-0,5 x) U_ {xx} + e ^ t-1 [/ math]
[math] U (0, t) = 0 [/ math]
[math] U (1, t) = 0 [/ math]
[math] U (x, 0) = 0.01 (1-x) x [/ math]
Need to find a solution with accuracy [math] 0.0001 [/ math] on the interval [math] T = 1 / a ^ *, where a ^ * = max a (x, t) [/ math] Plot graphs of functions [math] u (x ^ *, t), u (x, jt ^ *) [/ math] where [math] x ^ * = 0.6, t ^ * = T/10, j = 1,2,4 [/ math]
explicit difference scheme is as follows:
([math] $ u_t ^ {j +1}-u_i ^ j) / tau = 3 (1,1-0,5 x_i) (u_ {i +1} ^ {j}-2u_i ^ j + u_ {i -1} ^ j) / h ^ 2 + e ^ {t_j} +1 $ $ [/ math]
code of the program:
int main ( void ) {
setlocale(LC_ALL, "rus");
int I = 10, J = 30, i, j;
double T = 1.0/ pow(3.3, 0.5), h_x = 1.0/ I, h_t = T/ J, epsilon = h_t + pow(h_x, 2), c;
double **u = new double *[I + 1];
for (i = 0; i <= I; i++) u[i] = new double [J + 1];
[code]....
displays the following:
[URL]
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May 27, 2013
I have a generic template class with another template in one of its types. Now I want to specialize one of its methods for a particular (template) class, which leads to a compile error, however.
Here is the example:
#include <stdio.h>
template<typename Type>
class Obj1 {
public:
void ID() { printf("Object 1, size = %zu
[Code] .....
GCC ends with:
:35:27: error: type/value mismatch at argument 2 in template parameter list for ‘template<class Type, template<class> class O> class Foo’
:35:27: error: expected a class template, got ‘Obj2<Type>’
What is wrong with the specialization? Can it even be achieved and how (if so)?
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Sep 21, 2013
I have a "fairly" large, std::map. Is there a way, to get the key of an element, by position? E.g., something like,
map.at(i).getkey
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Dec 24, 2013
So for a project I'm working on, I'm using an array and generating it's values randomly but unique. Currently I'm working on a 3X3 array and the generated values are in the range from 1-9. So I wrote a function that will tell me the position of the cell whose value is 9. This is the function I wrote:
Code: void Llogaritje1(int t[3][3],int &i, int &j){
int y,l;
for(y=0;y<3;y++){
for(l=0;l<3;l++){
if(t[y][l]==9){
i=y;
j=l;
break;
}
}if(t[y][l]==9) break;
}
}
But it doesn't work on all cells. Seems like at cells t[1][0] and t[2][0] the values that i and j take are 0 0 since when I print them after excecuting the function that's what it returns. I really don't understand why.
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Jan 25, 2013
I want to get the iterator position after to use find if:
std::list<Texture*>::iterator result = find_if(
texturelist.begin(),
texturelist.end(),
std::bind2nd<CompareTEX>(CompareTEX(),n_tex));
if (result != texturelist.end()) {
return // position result
}
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Feb 26, 2013
I am new to grpahics progamming in/under Borland C. I have included the "graphics.h" header file but i am unable to take input on the screen. If I try to move my cursor to a specified position using gotoxy() function the pointer doesnt moves to the specified location and starts taking input at (1,1) coordinate.
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Jun 4, 2014
I need to keep a data structure, which has an id, an object pointer and a position. this id is used to randomize things, the object and the position is attached to this id. So which way is better?
Code:
struct data {
int id;
ObjectBase* obj;
Vector3 position;
};
vector<data> vecData;
or
map<int, pair<ObjectBase *, Vector3>> mapData;
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Feb 21, 2014
i have two point P1 and P2 where i want to move P1 and P2 with keeping the distance and the position of the P2 relative to P1 i thought that when i keep the distance between the two point that involve keep in the same time the local position of P2 but when tested it does not work initial position of P1=(10.0f, 00.0f, 00.0f) initila position of P2 relative to p1 =(50,10,-8) we can get the global position of p2 ----- final position of P1 =(50,10,-8) final position of P2 in the world space =(40.31,8.06,-6.45) then we calculate the distance before and after we found that there are equal but when we calculate the position of p2 relative to p1 after and before we found that there are not equal.
how i can keep the local position and distance ?
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Nov 23, 2013
I used VB6 before to output file.
I set my output to file to tab(20) or tab(45) respectively.
In C++, how do I do this?
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Jul 8, 2014
I try to find charecter position but evey time i run my program it give me 0 position why ? Why in my getChar function give me warning statement with no effect i can not understand this warning where is my mistake.
Code:
void getChar(const char* str){
int lenStr = strlen(str);
int i = 0;
int posCharecter = 0;
printf(" %s has %d charecters length
",str,lenStr);
[Code] .....
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Mar 4, 2014
I have been working on a program that records the time it takes the user to complete a maze. The user's time is then recorded and inserted into a linked list of structures based on the time (from quickest time to longest). I wrote some code that does this, but I was wondering if I can make the code more concise/make sense -- like only using two pointers or having less if statements.Here is a struct that are the elements of the linked list (I also have a global variable to keep track of the head of the list:
Code:
//stores player's best time.
struct PlayerTime {
char name[MAX_STR_LEN];
float seconds;
struct PlayerTime* next;
[Code]....
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Jan 10, 2015
Here's my code
bitIndex = 5;
Code:
bool getBS(PBitSet _this, int bitIndex) {
if(_this->bits & (1 >> bitIndex))
return true;
else
return false;}
I want this code to return the value of the bit at position bitIndex. It can be either false or true. The problem is, that it always returns false, even thought I enter 16 as my number, so the 5th bit should be true.
0000|0000 = 0
0001|0000 = 16
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Feb 4, 2014
I have studied function,array,stuctures,flow of control(XI class cbse syllabus). Now I want to know how to find coordinates of cursor position in c++.
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May 12, 2013
I recently wanted to create a (yet) simple program that simulates a mouse movement.So far I managed to make the program work. It does move the mouse, click when expected but the problem is the location it does click at.Here's my code:
#include <Windows.h>
#include <stdio.h>
int leftclick (DWORD x, DWORD y);
int main(){
[code]......
The problem now is: I want the program (for testing purposes) to click at (1920, 1080) and (100, 100) afterwards. Now it does click within a specific range. When I use GetCursorPos to retreive the cursors position it differs quite a bit from where I expected the click to be.
a second question I have is: When I declare the following flag (in the code above) the program does use relative coordinates even though it shouldn't.
input.mi.dwFlags = MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP;
Where as it works out well when I add a MOUSEEVENTF_MOVE to it.I couldn't find any solution to this in Microsoft MSDN or any other website.
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Jan 11, 2013
I need to find position of certain character in string, so i made a function but it doesn't do what i thought it would.
Consider this string:
std::string line = "<foo> <foo> <foo> <foo> <foo>"
I need to find position of a third '>' character so i can get:
std::string other = "<foo> <foo> <foo>";
This is my function that fails:
std::size_t find_third(const std::string& line) {
std::size_t pos = 0u;
for(std::size_t i = 0; i < 3u; ++i) {
std::string tmp = line.substr(pos);
pos = tmp.find_first_of('>');
} return pos;
}
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May 3, 2014
After searching on stackoverflow I got this
POINT p;
for (int i = 0;; ++i) {
HWND hwnd = GetConsoleWindow();
system("cls");
if (ScreenToClient(hwnd, &p)) {
//p.x and p.y are now relative to hwnd's client area
} cout << p.x << " " << p.y;
Sleep(200);
}
I'm looking for a function that gives current mouse position(x and y) in that particular console window. I've tried above code but it is not working.
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Apr 18, 2013
I am trying to get the position of the matches of "Un" in string "Unseen University" in c++ code using STL regex. How can I do this.
i.e. I have following:
std::vector<std::cmatch*>* matches = new std::vector<std::cmatch*>*;
intMyReturnVal = regex("Unseen University", "Un", matches);
I can access a match by
matches->at(i)
and get an Iterator to the beginning of the match by
matches->at(i)->begin()
How can I get the relative position of the match within the entire target string (i.e. "Unseen University", where, in this case, the positions should be 0 and 7)??
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Feb 27, 2015
I have set a variable as follows:
Point clickLocation = new Point(0, 0);
But when I got to use
clickLocation = Cursor.Position;
It gives me an error of position does not exist? Does WPF not support this way?
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