C++ :: Reading From A File - Getting Empty Array?

Nov 30, 2013

I started making something for my class and the thing im getting stuck with is this function:

void ucitajOdgovore(string asocijacija[21]){
int brojac=0;
ifstream fajl;
string putanja;
/*srand(time(NULL)); int random=(rand() %5) +1;
switch(random){

[Code] ....

In the main, i pass real string array "asocijacije" in function which i use in it, and when i use it after this fun. i get an empty array. Its like it didnt happend and i cant see where i went wrong.

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C++ :: Count How Many Times Each Word Appears - Empty Output Array File

Sep 20, 2014

I am writing this program that is supposed to read a file, put the data into an array, alphabetize, count how many times each word appears and print to an output function. I posted before on how my program had an error when I ran it but I have fixed that. Now my outputArray file is empty. It gets created but there's nothing in it.

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>

using namespace std;
//global to this file

[Code] .....

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C++ :: Declaring Array To Be Empty

Jun 30, 2014

We have been assigned to create an iTunes library. Everything compiles in my other .h file but my main is not happy with my object declaration. It keeps stating "primary expression before '{'". Here is my main code:

#include<iostream>
#include<string>
#include<fstream>
#include"myTunes.h"
using namespace std;
//function protocols
void read(string);

[Code] ......

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C++ :: File Created But Empty

Jul 22, 2013

A file is created but its empty. And when I first create an entry and then display all the entries, it does nothing.

#include<iostream>
#include<fstream>
#include<iomanip>
#include<string>
using namespace std;

class comp {

[Code] ....

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C++ :: Template Encounter Empty Array

Sep 26, 2014

I wrote a template function which use dynamic array as parameter. But if parameter is a empty array, it have compile error.

code:
#include <iostream>
int arry[] = {1,2,3};
int empty_arry[] = {};

[Code]....

compile error:
[zengchao@cmcc-server2 ]$g++ test.cpp
test.cpp: In function ‘int main(int, char**)’:
test.cpp:16: error: no matching function for call to ‘array_parameter(int [0])’

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C++ :: Two Dimensional Array - Find Empty Inventory Slots

Feb 9, 2013

I made two dimensional array to represent my (game) inventory. Slot is empty if its value is 0 and 1 if not.

Now i need to find if i can put new item in my inventory that can take up 4x2 slots. I tried this but it doesn't work as i expected:

#include <iostream>
int main() {
const int inventorySlotRows = 5;
const int inventorySlotColumns = 5;
int arr[inventorySlotRows][inventorySlotColumns] =

[Code] .....

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C++ :: Filling Vector From A File - Adding Empty Element At The End

Apr 20, 2014

I'm having a problem filling a vector from a file. Basically, it is adding an empty element at the end. I'm new to Qt and haven't worked with file streams much so how to stop the stream before it adds the extra element.

void gui::get_data() {
mileage.clear();
QFile file(file_label->text() + ".txt");
QTextStream in(& file);
float m;
float g;
QString d;

[Code] ....

But, if I add another element to the vector and write that the file look like this.

//file after adding element
132654 0 02132014
132654 0 02132014
0 0
132998 22 02202014

I have it set to append at the moment so that is why the first line is repeated. I figure the problem is with if(in.atEnd()). I could fix it by deleting the last element right after adding it, but that seems like more of a hack than anything else.

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C/C++ :: Program That Count Empty Line And Display Whole File

Jan 6, 2015

I am new in c programming. I want to write a function that will count the empty line of the file and display the content.

/* ***************************
** creator: firstprint *
******************************/

#include <stdio.h>
/* function that will identify if line is empty or not */
is_empty(char *buffer) {
while(isspace(*buffer)) buffer++;
if(*buffer==0x00) return 1;

[Code] ....

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Visual C++ :: Reading Into Array / 2d Array From Mixed Text File?

Jan 18, 2014

I know to read a strings into array and tables.. what is they are mixed up?? strings are just names ( 3 characters) and there are bunch of table.. the max size was set to 60

ex. text file

JES
DAN
JEN
.
.
.
01010101
10010101
RAM
JET
01010010
10100101
.... and so on

should i use a while loop?

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C :: Writing Array Into File And Reading Array From File

Apr 20, 2014

i've been trying to write array into file and read them into the same program again, but the output is all wrong.

Code:

#include<stdio.h>
int main()
{
FILE *fp;
char name[3][7];
int x;
}

[code]....

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C/C++ :: Reading A File Into Array Then Reversing The Array

Jan 19, 2015

This is what I am supposed to be doing with this problem: Read the integer values in the file "numbers.dat" and display

* them in reverse order (that is, display the last number in the
* file first, the second-to-last second and so on). Use an array to
* store the values. It is safe to assume that the file contains no
* more than 100 values.

I have gotten far enough to read the file and display as an array, but it is displaying vertically rather than horizontally. So it is displaying 10 and a 1 on the first line then the 0 on the second line. Before I can work the reverse part out, I need it to display each number as 10 line 1 -235 line 2 so on and so forth.

This is my code so far:

void display_array_reversed() {
ifstream fin ("numbers.dat");
if (!fin){
cerr << "Error opening file" << endl;
exit(1);

[Code] .....

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C :: Reading From A File And 2D Array?

Apr 25, 2013

So if I have a file that has a list of scores and the name of the student, how am I going to read the scores and names, and print to output? For example, the text file will look like:

83 75 89 90 75 67 John Doe
67 92 78 64 88 95 Jane Waters
76 65 87 70 97 76 Billy Bob

And they'll be printed like that too.

I made a 2D array for the scores and names, and was able to scan the scores into the scoreArray, but I am stuck for the names. Do I use fscanf, fgets, etc? And how do I use these for a char array?

insert Code:
int main {
int scoreArray[NUM_ROW][NUM_COLUMN];
char nameArray[NUM_ROW][SIZE];
...........opened file, etc.

[ for (row=0; row<2; row++)
{ if(row>0)
{printf("

[Code] ....

When I run this, I get the scores and names (somewhat) in a jumbled mess.....

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C++ :: Reading In TXT File To 2D Array?

Mar 27, 2013

My assignment is to read in from a .txt file two things: an integer and a string. After reading in these 2 items I have to put them into a 10x10 2D array so that both the number and the character can be manipulated by the user. Here are the contents of the text file:

Dr. J's Garden
0.21,B, 2.80,G, 4.96,B, 2.66,B, 4.48,B, 0.61,T, 0.40,B, 3.50,G, 3.63,B, 3.91,T,
2.33,T, 4.51,G, 1.15,G, 4.95,T, 2.76,T, 4.51,T, 2.54,G, 4.04,T, 2.38,B, 0.62,B,
4.54,G, 3.38,T, 1.57,T, 3.92,T, 3.03,B, 4.72,G, 0.23,B, 4.02,G, 4.69,G, 0.66,G,
1.34,T, 2.21,G, 2.48,G, 4.85,T, 3.25,G, 3.55,G, 4.78,B, 0.81,G, 0.74,G, 2.55,G,
3.35,G, 4.52,G, 4.81,G, 2.67,G, 4.97,B, 0.87,G, 1.28,G, 4.58,B, 1.91,B, 3.69,B,
3.02,T, 3.15,T, 1.08,T, 4.68,G, 1.10,B, 3.17,G, 1.97,T, 0.99,G, 4.50,T, 3.87,T,
3.36,G, 1.60,T, 3.73,G, 2.14,B, 3.68,B, 2.44,G, 3.10,G, 4.54,B, 0.25,B, 0.25,G,
1.79,B, 3.02,G, 2.21,T, 0.22,G, 3.67,B, 4.46,G, 2.14,G, 2.31,G, 0.80,T, 3.83,B,
1.56,B, 1.41,T, 0.80,G, 1.27,T, 0.08,B, 1.20,G, 2.88,B, 2.78,T, 3.30,B, 1.75,B,
2.60,G, 4.72,T, 4.55,T, 0.89,B, 0.52,B, 2.06,T, 0.28,G, 4.36,T, 4.41,G, 0.36,B,

One number and one character need to be assigned to each element of the array. I know exactly how to fill a 2D array when it's just numbers, but the characters and the commas are giving me a lot of trouble.

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C++ :: Reading File Into Array?

May 10, 2012

i'm reading a file which has 20 rows and random number of columns, i want to put them in array/vector which i did but the problem is that array is filling a cell with a garbage value at location where i don't have a value in the data file.

suppose i have data file like following (there is tab between each column and each row has different number of columns)

Code:
20 30 10
22 10 9 3 40
60 4
30 200 90
33 320 22
here is my code

Code:
#include <vector>
#include <iostream>
#include <fstream>

[Code]....

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C++ :: Reading A File Into Array Of Struct

Nov 20, 2014

Code:
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
struct inventory

[Code]...

This is my program output Enter the file name : "filename".txt ..... (Nothing shows up)

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C :: Reading A File Into Array Of Pointers?

Mar 24, 2013

why when I print out "array[2]" nothing prints? It just prints blank space. My file definitely has text in it, but when I try to assign "text" into the array of pointers it won't show any text. I know fgets() appends a newline at the end of the string, not sure if that has anything to do with it, but I've tried printing everything that should be in "array" with a for loop and I get nothing.

Code:
#include <stdio.h>
#define FILEPATH "/home/user/Desktop/text"
int main(){
FILE *myFile = fopen(FILEPATH, "r");
if(myFile == NULL) return 0;
char text[100];
char *array[100];
int idx = 0;
while(fgets(text, 100, myFile)){
array[idx++] = text;
}
puts(array[2]);
}

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C :: Reading File To Array Of Structures

Jun 9, 2013

I have to write a program that reads from a text file, which contains a list of stock hourly prices and the company names. Something like this:

78.52 82.56 75.10 71.97 Water Company
22.40 25.68 21.37 22.96 Mega Shipping Inc

There's suppose to one array of companies, where each company will be kept in a structure that contains: a pointer for the name, an array of the prices, and the average price for the day. The structures will be kept in an array of structures.

My question is, how do I read the data from the file and put the data from each line into the next structure in the array of structures? I read the numbers in fine. I just use:

Code: fscanf(fp, "%f", &companyAry[i].hourlyPrices[j]);

But my program crashes when I try to read the name.

Code: fscanf(fp, "%[^]", &companyAry[i].companyName);

I'm thinking it has something to do with the fact the companyName is a pointer.

My structure looks like this:

Code:

typedef struct {
char *companyName;
float hourlyPrices[NUM_PRICES];
float avgPrice;
}
COMPANY;

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C :: Reading Values From CSV File Into Array

Jan 21, 2014

My problem is that I need to take a csv or excel file with tens of thousands of datapoints, write all points in a section of column to an array, perform calculations on them, and then write it back into another column.

I've been looking all over the internet for ways to do this easily. So far I have not found anything that I can follow and implement.Some codes have been slightly useful, but they aren't commented in a way I can understand. How to write code to take, for instance, lines from column b between 500-1000, write them to an array, and write another array 500 characters in column c. If that code could be commented, I have tried a few different techniques (counting commas), but haven't gotten anything to work.

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C :: Reading Data Into 2D Array From A File

Apr 29, 2013

I'm having issues reading to a 2d array from a file. When I try to read the data from my file into my matrix variable it simply doesn't read anything and leaves the variable unmodified. I've tried just reading the first piece of data in the main function and it doesn't work there either. I'm really perplexed at this point since I've never had an issue reading from a file before. Here's my relevant code:

Code:
int main(int argc, char** argv) {
double matrix[MINSIZE][MINSIZE]={0}, vectors[MAXSIZE][MINSIZE], ans[MAXSIZE][MINSIZE];
FILE * inFile;
inFile = fopen(FILENAME,"r");
if(inFile==NULL){
printf("File does not exist.

[Code] .....

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C :: Storing A Value In Array From Reading In From A File

Sep 12, 2013

Is something like this possible and if not how can I make this work?

fscanf(in, "%d %d %d", &i, &x, &arr[i+x]);

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C++ :: Error Reading File Into Array

Feb 6, 2013

I am working in Eclipse, and it keeps giving me this error that I do not understand. In the fillTable function, "is >> kP[i]" Eclipse says: no match for 'operator>>' in 'is >> *(((TranslationTable<int, std::string>*)this)->TranslationTable<int, std::string>::kP + (+(((unsigned int)i) * 8u)))'.

#ifndef TRANSLATIONTABLE_H_
#define TRANSLATIONTABLE_H_
#include "KeyValuePair.h"
#include <iostream>
#include <cstdlib>

[Code]....

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C++ :: Reading Int From Text File With 2D Array

Nov 3, 2014

Reading in a maze into a 2D array. The first two reads will give me the dimension of the maze(ex. m x n maze). So in order to create the 2D array i need the first two reads. Then after it is created it will read the rest of the data which are 1s and 0s. I have to create a program that will solve the maze but i cant test my movement code if i cant read in the data first. the entire program compiles but to test if i read the file i have a function to print it. But it says "There are: 0 rows and 0 columns " so it didn't read anything since rCount and cCount are initialized to 0. and basically the maze has nothing in it.

Code:
#include <iostream>
#include <fstream>
#include <stack>
#include <cstdlib>
#include "position.h"

[Code] .....

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C++ :: Reading Strings From File To 2D Array?

Apr 27, 2013

I have a text file with scores and names.

I have to read the score into an array and the names into an arrays also

27,Tom Jefferson
23,Ozzie Osborne
18,Wilt Chamberlain
15,Marie Antoinette

I've gotten the score to display correctly, but i cant get the full names. My function only reads the first names

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C++ :: Reading A File Into Array Of Struct

Nov 21, 2014

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
struct inventory {
int barcode;
char description[512];

[Code] ....

This is my text file
20123451
Sugar packet (1 kg)
2.50
560
21347652
Milo 3-in-1
12.50
200
20123453
Salt (1kg)
4.50
270
21347654
Nescafe 3-in-1
12.50
400
20123455
Tamatoes
4.00
100
21347656
Cucumbers
4.00
280

This is my program output
Enter the file name : "filename".txt
..... (Nothing shows up)

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C++ :: Reading Lines From A File Into Array?

Sep 1, 2014

The first part of the exercise is to read the lines from a file placing each line into an array. I thought my code looked correct however nothing but garbage prints out. Here's my code.

#include <iostream>
#include <fstream>
#include <string>

[Code]...

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C# :: Reading A File Into A Byte Array?

Jun 25, 2014

I basically want to create a save editor application that will enable people to alter various values in the save by clicking on releveant buttons and then also for the editor to auto update the checksum when changes are done.

The save file is in hex so from what I can gather I would need to create a button to open the file using 'open file dialogue' and then read the file into a byte array so that the values can be called at any time when a particular butto is pressed and the application will then seek to the point in the file to make the required changes.

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