C++ :: Ifstream Input To Different File Types

Mar 14, 2014

I want to create a function with a return type. However, I want to use it to read from a file (ifstream) and produce multiple different types of return types. The different file types returned would be always in the same order. For example

Text File:
Name
1
12
30
Area

I want to ifstream line 1 (Name) to an array of characters.
line 2, 3, and 4 to integers.
and line 5 as a string.

The basic problem is that if I make a function with one return type, it would only return one type of data to my int main(). I suppose I could create multiple functions that would run this for different variable types and destroy the invalid types. But this seems inefficient. It is being used to load in data from a previously saved file.

So far..

//function to load a player's data
string loaded(string fileName) {
ifstream loadfile;
loadfile.open(fileName);

[Code] .....

I was thinking I could possibly do something with a counter to count the lines and assign a value based on their order. The problem is with the 1 return value of a function. Maybe there is another operation I could use?

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C++ :: How To Open File TXT That User Input In Ifstream

Sep 9, 2013

How to open a file that the user input

ifstream InFile;
ofstream OutFile;
InFile.open("???.txt")

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C++ :: Ifstream Doesn't Read From The File

Aug 14, 2014

I wrote a program which was supposed to decrypt a file encrypted with the XECryption algorithm. Now, I know the decryption algorithm, but I have a problem with my ifstream object. It doesn't read anything at all, and the ofstream object just outputs a single random byte in a never ending loop. I've tried using cin, which works correctly, but it's not what I want.

Here's the code:

#include <fstream>
#include <iostream>
using namespace std;
int main() {
ifstream in("file.in", ios::in);
if (!in.is_open())

[Code]....

I'm doing this on a Windows 8(.1) pc with Code::Blocks 13.12. In the file (file.in) I have replaced the points with spaces. What is wrong with the code?

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Feb 3, 2014

I have a text file that ifstream opens and fills some fields with the data. I've been able to get at the file, by using the precise path, but that path would be incorrect on other computers I'll be working on the project at. So, is there default location I should drop the folder in, and route to with the path? If not which Directory listing in Visual Studio 2013 should I use so the project can find the folder?

This is how I've formatted the string for ifstream.

".DataSampleActorData.txt"

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C++ :: Ifstream Object Won't Connect With A File

Oct 9, 2014

Is there a way to make this program work without entering the full path to a file?

Code:
ifstream ex("podatki.txt", ios_base::in); // if I type full path than program works
if(ex.is_open()) cout << "The file is open and con. with the object." << '
';
else cout << "you messed up" << '
';
int counter = 0;

[Code] ....

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C++ :: Reading Different Types Of Input Into Array

Jun 30, 2012

Let's say I have a list of words that are followed by a number.

Word 1
Word 2
Word 3
Word 4

I need two arrays. One for the words and one for the numbers.

Code:
string STORE_ARRAY[100];// stores string (word)
string operation[STORE_ARRAY];
int PARA_ARRAY[50];//stores parameter (#)
int parameter[PARA_ARRRAY];

For the file input, I'm using this:

Code:
in.is_open()){
string line;
while(getstring filename;
cin>>filename;
vector<string> file_input;

[Code] ....

So first it gets saved in file_input, but then it needs to split it and move it into the appropriate array.

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Feb 1, 2013

where to start and how it should be structured. how I should go about writing this program, like should i make functions, pointers, etc. And to display the menu, is it easiest to just use printf statements or is there something more efficient.

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C++ :: Creating Binary Tree Program - Allow User To Input Data Types

Apr 23, 2013

In class we were asked to create a C++ BTree program that would allow a user to input the following data types and then store said data in a .txt file:

0. ID 8 bytes

1. First name 30 char

2. Last Name 30 char

3. Street Address one 30 char

4. Street Adress two 30 char

5. City 30 char

6. State 20 char

7. Zip 10 char

8. Country 30 char

(I'm not particularly asking for full code, pseudo code would also be great). I had a great deal of my work done, unfortunately, the computer I was working on crashed, corrupting my files.

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C :: Parameter Names Without Types And Conflicting Types In Fgets

Jan 22, 2014

I have this

Code:

#include<stdio.h>
#include<ctype.h>
#include<string.h>

int check_up(char string[]);
int check_low(char string[]);
void to_up(char string[]);
void to_low(char string[]);

[Code] .....

When I compile this I have the following problems: warning: data definition has no type or storage class [enabled by default] in 'to_up(word)'conflicting types in 'to_up' function and to_low function warning: data definition has no type or storage class [enabled by default] into_up function error: unknown type name "word" in line 'printf("All uppercase %s. ", word):;'warning: parameter names (without types) in function declaration [enabled by default] in 'to_up(word)'and 'to_low(word)' 'note: previous declaration of "to_up" was here in function declaration of to_up function

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May 1, 2014

How to do the problem below using loop?

Input numbers until the user types a 0, then output the product of the non 0 numbers: e

E.g., if the user types 2 4 6 0, the program should output 48

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C++ :: Retrieving Class Types From File Efficiently

Jun 30, 2014

Suppose your program has many concrete subtypes of Person, and each person will have their own file saved, with their type stored in that file. When reading the files to create the people again (of their proper types), what is the best method to maximize performance (and elegance by shortening the code)? Here is what I have so far.

First I used if statements, which is terrible, and now I've improved the performance logarithmically using std::map. I still suspect there is a better way, especially if there are going to be hundreds of different classes. If you want to test it, you can change the PATH constant to whatever path you want, or just leave it as an empty string, and the files will be created in the same directory as your cpp file. The part I'm trying to improve is pointed out in the comments.

struct Person {
std::string name;
Person (const std::string& newName) : name (newName) {}
virtual ~Person() = default;
};
struct Guy : Person {using Person::Person;};
struct Girl : Person {using Person::Person;};

[Code] ....

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C++ :: Naming Files And Making File Types?

May 12, 2013

How to deal with files and I wanted to make a way for the user to make his own file name and then I want it to be a .txt file, so I take the fileName variable after the user has created a name for it then add ".txt" for the file type then convert the string to a constant char for the open method.

#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main() {

ofstream fileObject; // ofstream object to read/write to and from file

[Code] ....

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C++ :: Reading Mixed Data Types From A File

Mar 28, 2015

How to properly read data from a .txt file.

If I have data stored in a .txt file, which is formatted/stored like this:

Code:
Apples and Strawberrys
10
Cherrys
12
Pears
16
Grapes, Melons, and Peaches
20

I know that if I read/extract, and print the data like this;

Code:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ifstream dataFile("test.txt");
string textData;
[Code] ....

Each line of data is stored in the string "textData" and printed to the screen, exactly as it was stored in the .txt file. So, all is clear to me up to that point.

But, what if I wanted to store each line of text in the string "textData", and store the numbers/integers into a separate variable called "numberData"? How would I retrieve and store the numbers (in the above example .txt file, every 2nd line) separately from the text?

For now, to keep things simple, let's assume that the data in the .txt file is stored/formatted as in my example (1 line of text, 1 line containing a number/integer, ...repeat) so, there is no need to test if the retrieved data is actually text or an integer, before it is stored in the appropriate variable type.

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Jan 12, 2015

I want to access specific lines in a "*.txt" file. I've heard of seekp() and what not, but don't know how to call them as such.

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Sep 5, 2013

How do I convert ifstream to binary and display the binary at the end. I have a file that when it contains numbers it can do it but when reading strings it has trouble. It acts as if there is no binary in the file.

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C++ :: Ifstream Not Reading Next Line?

Aug 3, 2012

I have a file blah.txt like this:

3 1 4
1 2 3

and here is my code to read in that file:

Code:
int x = 0, y = 0, z = 0;
ifstream data("blah.txt");
while(x != 1)
{
data >> x >> y >> z;
}

For some reason, it just keeps readin in the values: 3 1 4

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C++ :: Passing Ifstream Object Between Functions

Mar 29, 2013

Code:
void lexer(ifstream& inputfile) {
string line;
getline(inputfile,line);

[Code] ......

I am trying to pass input file between two functions. The code compiles but immediately upon running the program, there is a "bad cast" run time error.

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C++ :: Using Ifstream To Open Multiple Files

Apr 28, 2014

I am currently working on a C++ program for school. I am actually not finding too much difficulty in constructing the functions, enum-types, arrays and structs, however, I am finding great difficulty in using on ifstream variable to open multiple files.

I have posted the entire code that I have so far (even though I have pinpointed the issue to not properly opening the second file in ifstream).

I spent a couple of hours getting rid of certain functions/procedures, loops and variables and I get the same output (if what I removed doesnt crash it). I also get the same output whether I "open" the second file or not (meaning I removed all of the code for it and got the same output).

Here is the code (it's not finished because I am stuck on this file issue). It's a bit messy since I am now in debug mode versus program mode:

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Nov 13, 2013

If I have a data file.dat like this, for example:

...
other information
...
physics:
4,5,6,7
...

line:
(4,2), (2,4)

line:
(1,2), (2,3)

...
...

I want to design a class and corresponding code so that every time when it reads "line:" for the file.dat , it will push_back a new line into the line_t vector, and each time when it encounter physics it will put the values to physics, How can I implement this?

every data in file.dat is useful, they need to be read into different class type. How can I implement this?

class line_t {
public:
vector<point_t> P(2, point_t());

[Code].....

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C++ :: Ifstream Object Passing To Functions

Feb 29, 2012

I am having an issue with passing an ifstream object to functions. Here is the code:

Code:
#include <fstream>
using namespace std;
void otherfunction (ifstream *ifs) {
...does stuff, like ifs->open(), then reads from the file...
}

int main () {
ifstream ifs();
otherfunction(&ifs);
}

Here is the error message:

Code: error: cannot convert ‘std::ifstream (*)()’ to ‘std::ifstream*’ for argument ‘1’ to ‘void otherfunction(std::ifstream*)’

Why can't I do that? What does "ifstream (*)()" even mean? And I don't want to change the structure of the program. I have reasons for declaring the ifstream object in the main function (because there are actually two functions that need access to the ifstream object -- neither of which is working).

Also, if I change the main function to be this instead:

Code:
int main () {
ifstream ifs();
ifstream *ifsptr = &ifs; //EDIT 2: forgot the ampersand
otherfunction(ifsptr);
}

I get the same error as above. However, if I change the main function to this:

Code:
int main () {
ifstream *ifsptr = new ifstream();
otherfunction(ifsptr);
}

I get all kinds of crazy errors about "undefined symbols for architecture _____". Here is the actual error message from my program (parseArgs is the real name of otherfunction)

Code:
Undefined symbols for architecture x86_64:
"std::ios_base::Init::Init()", referenced from:
__static_initialization_and_destruction_0(int, int)in cchumGBV.o
"std::ios_base::Init::~Init()", referenced from:

[Code] .....

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Apr 23, 2013

I've been working on a student data base that reads in the students name, birth date, social security, and department name (or major). I have all these items in the header files respectively; nameType, dateType, personType, and studentType.

I am now to create another header file called HWONEHEADER that contains the functions showMenu, loadStudent, insertStudent, searchByName, and SaveStudents. This is how far ive gotten

#ifndef HW
#define HW
#include <iostream>
#include <fstream>
#include <iomanip>
#include "studentType.h"

[Code] .....

Here is the cpp file i have.

int main() {
studentType department;
cin>>department;
cout<<department;

[Code] .....

I need with the HWONEHEADER using the ifstream and ofstream operators to load all the students information into a file called student.dat I'am extremely confused because i can't find anything in my textbook about using ifstream and ofstream operators.

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Mar 11, 2014

I am trying to run the code below but I receive the following error message :

Debug Assertion Failed!
Program: C:TestDebugTest.exe
File: c:program filesmicrosoft visual studio 10.0vcincludevector
Line:932

Expression:vector subscript out of range

Code:
#include <fstream>
#include <cstdlib>
#include <iostream>
#include <strstream>
#include <cstring>
#include <cmath>
#include <map>
#include "Swap.h"
#define SIZE_X 100

[Code] .....

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Jun 21, 2013

I'm doing a project that takes in a input file with Quarterback statistics. It has their name, team, completions, sacks, touchdowns, etc. It has 16 different variables in all (17 if you count first/last name as two). So I'm trying to read them and I can't figure out how to jump to the new line after it's read the file and put the information in the variables I've created.

#include <iostream>
#include <fstream>
using namespace std;
ifstream din;
void openFile() {

[Code] ....

That's the program I've written. The loop keeps displaying the first line of the file over and over. How can I get it to go to the second line, then the third, then fourth, etc? I need it to display all the lines of the file until it reaches the end of the file.

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Jun 5, 2014

I have been trying to figure this out for a text based game. Lets say your money is 500. Then you save your game, but when you start the game the starting is 50, so when you load it, you still have 500 money, I tried lots of test, and im having trouble?

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Jan 30, 2013

I'm trying to pass an reference of the object ifstream to my constructor as such:

// myClass.cpp
int main(){
ifstream file;
myClass classobj = myClass(file);}

I am defining the constructor as follows, in myClass.cpp:

myClass::myClass(ifstream &file){
// do stuff
}

I get the error of "No overloaded function of myClass::myClass matches the specified type."

Also, when I build the program, it tells me "syntax error: identifier 'ifstream'"

Also, I made sure I included this:
#include <iostream>
#include <fstream>
#include <sstream>

What am I doing wrong? How can I pass an ifstream reference to my constructor?

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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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