C++ :: How To Read A File Into 2D Array

Nov 15, 2014

I'm finishing up my first semester as a Computer Science major, but I'm struggling with programming.

I need to read a file into a 2D array.

Here is what the file contains (90 characters):
S
R
R
S
R
R
R
R
S
....

Here is my current code:

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

[Code]....

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C++ :: Read A File And Put In A Array

Jul 4, 2013

I need to do a program that reads a file, that contains something like this:

8 2 3 4 2
5 6 1 3 4
3 1 4 6 7
7 2 4 1 3
3 2 1 6 8

and put in a array[][] in the program..I did this:

int main(){
using namespace std;
int size=0;
char line[1300];
FILE *file;
char path[50];
int l=0,c=0;

[code].....

But when i print A[3][3], it does not contain the correct value, but I strange value, like -36893488147419103000 .My idea was to pass line by line of the file, including the values that were not " ", to get only the numbers.

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C++ :: Can't Read Floats Into 2D Array From File

Apr 11, 2014

I can't get the values correctly parsed.

Code:
float **get(int sizeX, int sizeY) /* Allocate the array */ {
float** ary = new float*[sizeX];
for(int i = 0; i < sizeX; ++i)
ary[i] = new float[sizeY];
return ary;

[Code] ....

test.txt (without the comments).

Code:
2 3 // columns and rows of 2D array
0 0
1 1
2 2

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C :: Unable To Read TXT File Into 2D Array

Jan 30, 2013

here is my code, I'm trying to read a .txt file into a 2D array... what's wrong with my code?

Code:

#include <stdio.h>
#define INPUT_FILE_GET_NAMES "names.txt"
#define INPUT_FILE_GET_SALES "sales.txt"
#define MAX_ROWS_NAMES 25
#define MAX_COLS_NAMES 20
#define MAX_ROWS_SALES 25
#define MAX_COLS_SALES 6
//Function Declarations
char getNames(char namesArray[][MAX_COLS_NAMES], char filename[]);

[Code]...

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C++ :: How To Read Data From TXT File Into Array

Feb 25, 2013

I wanna read a txt file like this
1.00518 2.01903 3.01139 4.01343 5.02751 5.99913 7.00011 7.99851 .....
and fill the array P[i][j] with the data.

I try to use

if (myfile.is_open()) {
//for (int i = 0; i < 1; i++)
//{
getline (myfile,DMArray[0]);
cout << DMArray[i] << endl;
//}
myfile.close();
}

But this read the data into a string. How should i do with this string. Besides I know the dimension of the data I am reading.

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C++ :: Code To Read 2D Array From TXT File

Apr 11, 2013

So the premise of my code is to read in a 2d array from a .txt. The array is a game board but the first two lines are what determine the size of the board. After i read it in i want it to find wherever te character "U" is, and then display the array but only showing U and whats around it. Problem is i cant get the array to print the right size and the code for displaying the U is not working either.

ifstream inputFile;
int boardSizeRow;
int boardSizeCol;
inputFile.open("C:UsersMichaelDesktopfileboard2.txt");
inputFile >> boardSizeRow;
inputFile >> boardSizeCol;
inputFile.get();

[Code]...

FILE:

20
20
WWWWWWWWWWWWWWWWWWWW
W GO W W
W WW w S W
W H W GW w W
WPW WW G W
WK W W
W W W W w w W
WK WU W
SW w w W
W W
w W G W
G W w W
D wwwww W
K w D W
w w W w w W
ww w WWWWWWW
G w W
ww w S w W
WWW G W
WWWWWWWWWWWWWWWWWWWW

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C :: How To Read A Text File Into Array Of Strings

Mar 3, 2013

In a program, I have a text file (called MyDictionary.txt) which has thousands of words in alphabetical order. I need to make a C program that reads in this text file and then makes an array called char Words[# of total words in the text file][length of longest word].

Aarhus
Aaron
Ababa
aback
abaft
abandon

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C++ :: Read A File Into 2D Array And Display Data

Nov 15, 2014

I am currently working on a problem where I read a file into a 2D array, and display data. If you saw my code earlier, this is the same problem, but I am now further along.

The file (90 characters) looks like this:
S
R
R
S
R
R
R
R
S
S
....

The "R" resembles rainy days, the "S" resembles sunny days, and the "C" resembles cloudy days. There are 90 characters in the file. The first 30 are for the month of June, the next 30 are for the month of July, and the last 30 are for the month of August. The 31st day of the months are NOT included.

I read the data into a 3 x 30 array, where the row indicates the month (0 = June, 1 = July, 2 = August) and the column indicates the number of days in each month.

Now I need to create a function that creates a report and displays, for each month AND for the whole 3 month period:
1) The number of rainy days
2) The number of cloudy days
3) The number of sunny days
4) Which of the 3 months had the largest number of rainy days

Here is my code so far:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
const int MONTHS = 3;//Number of months

[Code] .....

There are no compiling errors, but I am not getting the data I want. My rCount and cCount variables end up being 0, and my sCount variable is 90.

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C++ :: How To Read Information From Text File To Array

Apr 4, 2014

Perhaps my original wording on this was confusing so I will ask a different way.

if I have a text file called

data.txt

and it has the following in it.

12345
67890
12345
67890

how would i read this information into an array called

int data[4][5]

This is in C.

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C++ :: Read From A File And Place Data Into Array

May 3, 2014

Assume you want to read from a file and place the data from the file into an array. The array can hold 10 integers. The file may contain any number of integers with 1 integer per line. Fill in the missing loop test condition so that we will read from the file until either end of file occurs or the array is full. Note we are using cin to read from the file since input redirection is being used.

cin >> temp;
arrayIndex = 0;
while ( _____________________________________) {
array[arrayIndex] = temp;
arrayIndex++;
cin >> temp;
}

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C/C++ :: Determining Length Of Array Read From File

Feb 16, 2015

i have to read a file with between 5 and 10 pairs of numbers, each on a different line. i can read the file, and wrote something to save the length of the file as a variable, but when i use it i start returning crazy data. the problem is in the do while loop and i want to change the i< in the for loop to "lines" so the code stops when the last digit is read. if i use i<10 the file has extra digits is the file is only 8 or 5 pairs of numbers.

FILE *Fpointout;
FILE *Fpointin = fopen ("test.txt","r"); //read this one
Fpointout = fopen ("out.txt","w"); //write this one
if (Fpointin == NULL) //if no file in source {
printf ("File does not exist."); //tell user it is not there

[Code] .....

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C :: 1D Dynamic Array Crashes When Read From File Into A Function

Mar 17, 2014

code:

/part of main function
int *A=NULL;
//load from file
load_from_file(A, &next);
printf("next=%d
",next);
getchar();
printf("A[%d]=%d
",0,A[0]);getchar();//here program crashes
}

[code]....

I initialize array A with NULL in main, and I "load" it with elements from a file. The code without function is working. But when I tried to use a function as above, my array crashes!!!

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C++ :: Unable To Read Data File From Two Dimensional Array

Apr 27, 2014

I am new to C++ and I am having an issue reading in a 2 Dimensional array from a data file. I am very close to reading it in perfectly except for one issue, the loop is ignoring the first value from the data file.

This is the code I have so far:

#include <iostream>
#include <string>
#include <cctype>
#include <algorithm>
#include <functional>
#include <conio.h>
#include <iomanip>
#include <string>
#include <fstream>

[Code]...

This is the values from the data file:

300 450 500 210
510 600 750 400
627 100 420 430
530 621 730 530
200 050 058 200
100 082 920 290

When the Program shows my array it comes up as:

450 500 210 510
600 750 400 627
100 420 430 530
621 730 530 200
050 058 200 100
082 920 290 0

Every array location is moved up one, like the program just completely ignored the 300 at the beginning.

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C++ :: Read A Text File And Store Contents Into 2D Array?

Aug 2, 2014

read a text file and store the file contents into a 2D array?

100 101 102 103 104 105
106 107 108 109 110 111
112 113 114 115 116 117
118 119 120 121 122 123
124 125 126 127 128 131

Here's my code:

const int ROWS = 5;
const int COLS = 6;
int array[ROWS][COLS];
ifstream inputFile;
inputFile.open("table.txt");

[code]....

When i run the program and try and display the array, it doesn't work.

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C++ :: Sort Data From Text File Into Array As Its Being Read?

Feb 12, 2013

I am suppose to make a program that reads in data from a text file (integers only) and sorts them as it inserts them into an array of size 10. I did this using an insertion sort, which worked great. But now I am being told that I need the function has to read ALL of the numbers in the text file, not just the first 10, and I am not allowed to store them THEN sort, it has to be sorted as being stored.

This is what I have for sorting first 10

void sortArray(int iArray[])
{
string fileName = "";
fstream inFile;
int tmp = 0;

[Code]....

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C/C++ :: Read Dictionary File Into Array And Check Spelling?

Jan 27, 2015

finishing my program which needs to do the following:

(i) Write code to read in the dictionary into an array of words

(ii) Write code to check the spelling of a word entered by the use

(iii) Like Scrabble / Countdown the user enters the letters they have and my code must find the word using the highest number of those letters

I have completed a good bit so far but I'm stuck on my checkSpelling() and findWord() functions as well as part (iii)

#include "stdafx.h"
#include <stdio.h>
#include "string.h"
int countCharOccurence(char *string, char c);
int getOption();
int checkSpelling();

[Code]....

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C/C++ :: Read Strings From File And Place Into Multidimensional Array

Mar 1, 2014

I am having problems figuring out how to place a list of strings from a text file into a multidimensional array that is something like words[NUM_WORDS][MAX_LEN]. I already run through the file once and count the number of words in it. I have tried a number of loops using fscanf and fgets, but I'm not sure if I am using them right -- this is my first time using them. The text file is a list of words in a dictionary, so the wordCount is about 45340.

Here is my code:

#include <stdio.h>
#include <string.h>
#define MAX_LEN 46
int main(){
int wordCount = 0;
FILE *inputFile, *outputFile;

[Code] ....

Like I said, the wordCount portion works. I added the printf statements at the end to see if anything was being saved, but it just prints two new blank lines. New to file reading and writing.

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Dec 10, 2014

I tried to make the program read from a file text the first name or last name but o cant seem to get it. i tried alot of different ways. how can i get the array of structure code to read form a file?

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;
const int NUM_STUDENTS = 17;
const int NUM_QUIZZES = 10;
const int NUM_EXAMS = 5;

[Code] .....

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Nov 4, 2014

I wish to read an excel file which contains the table shown at the picture below.

I don't really know how to code the direct storage of the values in the appropriate array.

For example I wish to store the countries in an array of a string type.

could I have some piece of code which illustrates it (I mean the reading of an excel file and the direct storage of his value in an array).

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Oct 16, 2012

I have been trying to read a comma separated .txt file into an array and print it to console in C++. The txt file consists of two columns of double type data. For some reason the program runs, but gives blank output in the console. I want to know if I am doing something wrong. So far this is what I have:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
int i=0;
double x[10];
double y[10];
string line;

[Code] .....

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May 13, 2012

I am trying to read from a data file that has input as :

12.0, 11, 123
14.0, 12.1, 3

And I want the program to read the data from the file and then make it into an array of structures and then print that array afterwards.

Code:
#include <stdio.h>
#include <stdlib.h>
#define MAX_INPUT 1000
int n =0;
int i = 0;
typedef struct {
double x[MAX_INPUT];

[Code] .....

The program when run gives the following output:

Ishtiaque-Mohammed-Khans-MacBook-Pro:Comp20005 IshtiaqueMKhan$ gcc -Wall -ansi -o ProjectB ProjectB.c
ProjectB.c: In function "main":
ProjectB.c:59: error: incompatible type for argument 1 of "print_array"

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Aug 21, 2014

I would like to write a complete structure array to a file and read it back, recovering all the data. I have tried the following:

Code:

#include <stdio.h>
#include <string.h>
#define NUM 256
const char *fname="binary.bin";
typedef struct foo_s {
int intA;
int intB;
char string[20];

[Code]...

//---------------------------------------------------- but the mac field is reading back some random value repeatedly. Why is that? And how do I fix this?

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C/C++ :: Read Contents From A File And Use As Size Of 2D Array - Error C2087 And C2133

Oct 20, 2014

Goal:
Read contents from a file and use as the size of a 2d array.

Problem:
C2087: Line 27 : "a1" : missing subscript
C2133: Line 27 : "a1" : unknown size

Code :
int rows;
int columns;
ifstream fObject("inputdata.dat");
fObject>>rows;
fObject>>columns;
char a1[rows][columns];

I am not sure why this is occurring, or if there is a better way to do it.

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May 15, 2013

I want to read the contents of a file block (512 bytes) by block using low I/O read statements. Each record is 64 bytes long and has a pre-defined structure. The first 4 bytes are an unsigned integer; the next 20 bytes are ascii text, etc.

I have a buffer which I can access with buf[0] to buf[63] to read the first record and then buf[64] to buf[127] for the second, etc. However, I was wondering how to map a record so that I can refer to an integer as an integer and a float as float, etc. I can't create a struct and move the 64 bytes to it, as I will have alllignment/padding problems.

What is the standard way to deal with records in C?

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Jul 30, 2013

im trying to read in 1 array and get 2 as outputs from 3 different functions.my read array is easy enough were im getting confused is how to read that array, separate it and take out only the parts i want and place them into a 2nd, then again a 3rd array.i have the following so far:

Code:

#include<stdlib.h>#include<stdio.h>
#include<unistd.h>
#define SIZE 10
}

[code]....

this compiles without a complaint, but when i go to run it no longer responds after taking the 10th element (well 9th if counting from 0).I think i have the if correct for the even odd section, but when i try to populate B or C array with the output of that if statement from A is were i think things are dying...

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Mar 15, 2013

The Objective Of This Program Is To Create A File To Write Text And Read Back The File Content. To Do That I Have Made Two Function writeFile() To Write And readFile() To Read.The readFile() function works just fine but writeFile() doesn't.

How writeFile() function Works? when writeFile() function Execute It Takes Characters User Type And When Hit Enter(ASC|| 10) It Ask "More?(Y/N)" That Means What User Want? Want To Go Next Line Or End Input?

If "Y" Than Inputs Are Taken From Next Line Else Input Ends.

But The Problem Is When Program Encounters ch==10 It Shows "More?(Y/N)" And Takes Input In cmd variable.If cmd=='Y' I Mean More From Next Line Than It Should Execute Scanf Again To Take ch I Mean User Input.But Its Not!!! Its Always Showing "More?(Y/N)" Again And Again Like A Loop.

Code:
#include <stdio.h>
void writeFile(void);
void readFile(void);
int main(){

[Code].....

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