C/C++ :: Extracting Strings From Files
Feb 15, 2013
We have an assignment to produce code to gather a string of input from the user in which they are entering a date. We then have to extract parts of that string to make substrings, and display different formats for the date(I will add my code in here so you can see what I have done). It took me a long while plucking away at this to understand this part. You will see that at the end of my code I have opened a file months.txt. We were provided with a file which states months corresponding to dates. I.e. 01January 02February 03March 04April, and so on until December. Exactly how I have typed it is how it is in the file.
I understand how to open and extract what is in the file as a string. I have extracted this as a string called myMonth (as you can see in the code as well) NOW,
I am supposed to have the program search for the month in the file, matching that to the month the user has input earlier, and then use the number infront of that month. I understand the basics of using find(), and making substrings. But how on earth do you get the computer to correlate what the user has input for a month, to finding that in the file, and then using the correct number.
Here is the code I have done so far:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
string myDate; // Date input from user;
string myMonth; // Input from months.txt
[Code] ....
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Mar 14, 2013
What is the best way to define const strings when there are separate header and source files?
For example, I have a header that only declare some enums. In that same header I would like to add string representations of those enums so that I can print them easily i.e string_representation[my_enum] for debug and error printing and so on.
If I define them in the header file, I will get a linker error for multiple definitions. If I remove the definition, then I can not define it in the source file.
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Sep 2, 2013
'Write a program to match the user input string with the contents of text files and give the result as to which files contain the input string. This has to be done by using finite automaton.' (Any language can be used) So basically, the user will input a string (in the command line or a gui) and "we must pass the text files to the DFA" (I'm double quoting this because it's precisely what my professor told) and then display those files which contain the string. The string can be hard-coded, ie,the user will get the output file that contains a specific string. ex: 'hello'. The problem is, I have never done any program on DFA so I'm at a loss. how to write the program. Should I read the files first and then use some 'switch' or 'goto' conditions for the DFA? Below is a code I found on the internet for simulating a DFA accepting a specific string.
Code:
s: accept = false; cin >> char;
if char = "m" goto m;
if char = EOF goto end;
goto s;
m: accept = false; cin >> char;
if char = "m" goto m;
if char = "a" goto a;
if char = EOF goto end;
goto s;
}
[code]....
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Dec 27, 2012
I'm trying to calculate a series of times from start to end, and find out the duration between them, sum them up and see if they're above a certain value or not, for each particular instance.
My goal is to provide a prepared text file with time tags such as this:
Mon 19-Nov-2012 09:12 Mon 19-Nov-2012 09:34
Wed 21-Nov-2012 13:14Wed 21-Nov-2012 17:11
Fri 07-Dec-2012 15:21Fri 07-Dec-2012 15:26
=============================================
Mon 26-Nov-2012 12:50Tue 27-Nov-2012 15:29
Wed 12-Dec-2012 13:07Wed 12-Dec-2012 14:58
Fri 14-Dec-2012 14:22Fri 14-Dec-2012 14:29
And the program is able to calculate the total time relevant to each instance (instances separated by a line of '=').
Some form of number should somehow identify each instance or something similar and a text file is generated with total time printed for each instance. E.g.
Instance 1: 00h22m + 03h57m + 00h05m = 04h24m
Instance 2: 04h15m + 07h44m + 01h51m + 00h07m = 14h04m
Now I'm currently working on making the logic to calculate time within the ranges I'd like based on several parameters.
Are there any references I can use when it comes to working with strings in order to seek and extract these values in order to work with them? The documentation available on this website, despite being very informative, does not show practical applications of said class and I'm at a loss on how to implement the functionality.
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Jan 20, 2014
In my project , we need to create an Array of Unicode Strings . The Array will contain 5000 Strings.
I need to write those strings to a text file which can be opened or edited with NotePad.
Normal _tfopen and fwrite are not able to create notepad compatible .txt file .. I mean the file I created is not readable with Notepad though file open mode is "w+t"
How can I save my unicode strings to a text file
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Mar 1, 2015
I'm having trouble trying to extra the second row from the array:
Code: double data[10][10] = {{0,5,10,15,20,25,30,35,40,45},{0,13,22,37,54,62,64,100,112,126}};
When I do this, it posts the entire array:
Code: int x,y;
for(x=0;x<2;x++)
{
for(y=0;y<10;y++)
{
printf("%.0lf ",data[1][y]);
}
}
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Dec 5, 2014
So, I have a string and I need to extract numbers from it. I've tried different things but they are not working. So, Here is what I have:
int main() {
string myString;
char *strPtr;
cout << "Enter a string to evaluate: " << endl;
getline(cin, myString);
[Code] ....
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May 17, 2013
I have a string like this
const char *filename = "C:/Qt/progetti/worlds/fasr.world";
then I have a string like this
char *pathdir = "C:/Qt/progetti/worlds";
I would get this string: "worlds/fasr.world" how should I do ?
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May 16, 2014
Extracting integers from a string is trivial, but I am unable to find a function or code that will extract decimal numbers from a string.
I have a string that looks something like this:
" Asdf 1 1.3825 4.0000 12.0000 1.9133 0.1853 0.9000 1.1359 4.0000 "
Any tips on extracting the numbers (in decimal form) and storing them in a vector?
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Nov 30, 2013
I want to extract polynomial coefficient out of a string recieved by input, for example if i enter 4x^3+2x^4+3 , the resulting out put be : 2 , 4 , 0 , 0 , 3
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Jun 5, 2014
I have a program here that writes employee information into a text file called employee.txt. I don't have a problem writing into the text file.
I'm supposed to enter the employees ID and search for it. Then pull up all they're info.
This is what I have.
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
ifstream inFile;
ofstream outFile;
[Code] ....
This is the text file
Viktor,Luc,552,123 Home,5000
Joe,Luc,553,123 House,7000
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Apr 20, 2015
Create a simple data file like the example shown below containing the 4 dates below plus 10 or more additional dates. The file should include 1 date per line and each date should have the form MonthNumber-DayOfTheMonth-Last2DigitsOfTheYear with no extra spaces. All dates should be in this century. No error checking for invalid dates is necessary.
My Output displays like
February -19,1991
How do I get my program to ignore the dash between the dates?
#include <fstream>
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main(){
const int M = 13;
[code]....
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Feb 20, 2013
I got as far as getting a web page into an IHTMLDocument2 but I don't know what to do from there, all the examples I found are C# or .NET or something else I don't understand.
Any simple example in C++ of getting all the links from an IHTMLDocument2 ?
I was able to do this:
Code:
IHTMLElementCollection* collection;
hResult=document->get_links(&collection);
long nLinks;
collection->get_length(&nLinks); // returns correct number
collection->Release();
How do I loop through the collection and extract the actual links ? Also, if they come out as BSTR do I simple treat them as WCHAR* ? If I can do that I can figure out the rest myself.
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Apr 26, 2013
I am trying to automatically extract all time stamps in a pdf file. These are typically in a line like:
when="2010-07-30T15:20:30+04:00"
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Code:
CStdioFile InputFile;
if (InputFile.Open(FileName,CFile::modeRead)) {
[Code]....
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Sep 25, 2014
So this may be against the rules, not sure, grey area probably? However I just bought the PC game Oil Rush, and was having a look at how the assets are packed. As with most games the textures, scripts, sounds and audio are all free to access.
However the game data such as maps, models and other, are packed into UNG files, i.e a custom encrypted file format, which probably is also compressed. So I googled for an unpacker/extracter and found one which also comes with the C source. You can download here. [URL] ....
So I am trying to figure out how these authors work out this file format, from the source we have,
Code:
static const u8 unigine_mask[] = "xffx7fx3fx1fx0fx07x03x01";
u32 unigine_key = 0xa13cdbde;
Looks like a password of sorts. You then have to work out the complete understanding of the file formats, headers, blocks etc.. How is this done...
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Nov 29, 2013
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?
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Nov 28, 2012
I am writing a program to play rock paper scissors, and I am trying to get a vector to store the result of a given round of play, and output it as a declaration as to who won. I can't figure out how to store the values in the vector properly, and how to use the vector as an argument to output the result of play.
Code:
#include <iostream>
#include <iomanip>
#include <ctime>
#include <vector>
#include <cstdlib>
#include <string>
using namespace std;
const string name[4] = {" ", "rock", "paper", "scissors"};
const string roundResult[3] = {"computer win", "player win", "tie"};
[Code]....
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Sep 19, 2013
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#include <iostream>
#include <string>
#include <cstdlib>
#include <cmath>
using namespace std;
int main() {
cout <<"Option A: Drop one chip into one slot" << endl;
[Code] .....
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Jun 4, 2013
I have written a C++ program I have multiple of CSV file used as input, which I open one at a time and close it after extracting data to a output file which is the only file.
I run getline(inFile,line);
outFile << line << endl;
I run this code, and only part of it is goes to the output file I got, also have spacing randomly to specific file and inconsistent
But when I slower the code, like system("Pause") in the loop, I can get extract what I want perfectly....
Is my program running to fast, why getline would be skipping part of what things I want?
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Aug 2, 2014
I have a text file called (Test.txt) with the following text:
This is line one
This is line two
This is line three
How do I go about writing a program that will print a line of text (e.g. "This in line two" on the console screen?
All I can seem to do is display the entire text file.
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Apr 5, 2013
I am writing a program to hide files behind other files using Alternate Data Streams in Windows NTFS file systems.
The program is as follows:
Code:
#include <stdio.h>
#include <stdlib.h>
int main(void){
char hostfile[75], hiddenfile[75], hiddenFileName[15] ;
printf("Enter the name(with extension) and path of the file whose behind you want to hide another file: ");
scanf("%75s", hostfile);
[Code]...
The complier is showing error as "Extra Perimeter in call to system" but I am not getting where?
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Jan 16, 2014
I am writing a piece of code that requires me to display the last 1000 lines from a multiple text files (log files). FYI, I am running on Linux and using g++.
I have a log file from which - if it contains more than 1000 lines, I need to display the last 1000 lines. However, the log file could get rotated. So, in case where the current log file contains less than 1000 lines, I have to go to older log file and display the remaining. For e.g., if log got rotated and new log file contains 20 lines, I have to display the 980 lines from old log file + 20 from current log files.
What is the best way to do this? Even an outline algorithm will work.
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Apr 7, 2013
I am programming a translator, and I have it so that it detects words with spaces both in front of and behind them, so I did "string.append(space);" where space equals " ". That added a space to the end, but I still need a space added to the front.
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Feb 12, 2014
I have a problem who must print the sentences who have lenght more than 20 characters. I dont know why, but it prints just the first words. Look what i made.
#include<stdio.h>
#include<conio.h>
int main()
[Code]....
For instance :
Give the number of sentences : 3
First sentence : I like the website bytes.com
Second sentence : I like more the website bytes.com
Third sentence : bytes.com
After I compile the program it should print the first two sentences.
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Sep 16, 2013
When including a header file in stdafx.h, should that file still be included in the source file where it is actually used?
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Nov 16, 2013
I tried to add 2 or more strings together but failed.
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