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txt data into 2d Array
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Hi I am new to this forum and to c++.I am having problems reading data from a txt file into a 2d array. The data is in the file like this
1 5 87
3 3 24
2 4 62
4 2 22
I am only suppose to read in the 3rd column into the array. I am opening the file but the data that I am seeing is not the data in the file.but all calculations on these columns are correct. I don't know how to do the 3rd column part .Here is the code that is giving me problems . Please help.I really need help in getting the data from the file into the 2D array.
#include <iostream>
#include <fstream>
usingnamespace std;
int main()
{
const int rows=4;
const int columns=5;
char wksales[rows][columns];
ifstream inFile;
inFile.open("c:/data.txt",ios::in);
if (!inFile)
{
cout << "Unable to open file";
exit(1);
}
int j,i;
for( i = 0; i <rows; i++)
{
inFile.read(wksales[i][j]);
}
for( i = 0; i < 4;i++)
{
for( j = 0; j <5;j++)
{
printf("%2d ", wksales[i][j]);
}
printf("\n");
}
//sum of each individual column
for (int col=0;col<columns ;col++)
{
int totals=0;
for(int row=0;row<rows ;row++)
totals= totals +wksales[row][col];
cout<<" "<<totals<<" ";
}
inFile.close();
return 0;
}
1 5 87
3 3 24
2 4 62
4 2 22
I am only suppose to read in the 3rd column into the array. I am opening the file but the data that I am seeing is not the data in the file.but all calculations on these columns are correct. I don't know how to do the 3rd column part .Here is the code that is giving me problems . Please help.I really need help in getting the data from the file into the 2D array.
C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <fstream>
usingnamespace std;
int main()
{
const int rows=4;
const int columns=5;
char wksales[rows][columns];
ifstream inFile;
inFile.open("c:/data.txt",ios::in);
if (!inFile)
{
cout << "Unable to open file";
exit(1);
}
int j,i;
for( i = 0; i <rows; i++)
{
inFile.read(wksales[i][j]);
}
for( i = 0; i < 4;i++)
{
for( j = 0; j <5;j++)
{
printf("%2d ", wksales[i][j]);
}
printf("\n");
}
//sum of each individual column
for (int col=0;col<columns ;col++)
{
int totals=0;
for(int row=0;row<rows ;row++)
totals= totals +wksales[row][col];
cout<<" "<<totals<<" ";
}
inFile.close();
return 0;
}
Last edited by Sashar400; Oct 8th, 2006 at 4:09 pm. Reason: Please use code tags for displaying your code.
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1. is the input file (data.txt) a binary file or a text file? If you can read it with Notepad.exe then its a text file, otherwise if the data is unreadable then its a binary file. Only binary files are read with iostream.read() function, text files use getline() or the imput operator >>.
2. wdsales() is a 2d character array. If data.txt is a binary file then you need an integer array
if data.txt is a text file, then read it like this
2. wdsales() is a 2d character array. If data.txt is a binary file then you need an integer array
C++ Syntax (Toggle Plain Text)
if data.txt is a text file, then read it like this
C++ Syntax (Toggle Plain Text)
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Originally Posted by Sashar400 
The file is in Notepad so I used that code.I also change the char array to int it's not working.
C++ Syntax (Toggle Plain Text)
<iostream> #include <fstream> using namespace std; int main() { const int rows=4; const int columns=5; char wksales[rows][columns]; ifstream inFile; inFile.open("c:/data.txt",ios::in); if (!inFile) { cout << "Unable to open file"; exit(1); } int j,i; //for( i = 0; i <rows; i++) { int wksales[rows]; inFile >> wksales[i]; } { { for(i=0; i<rows; i++) //show values read from file cout << wksales[i] << " "; for(j=0; j<5; j++) cout << wksales[j] << " "; } //printf("\n"); } //sum of each individual column for (int col=0;col<columns ;col++) { int totals=0; for(int row=0;row<rows ;row++) totals= totals +wksales[row][col]; cout<<" "<<totals<<" "; } inFile.close(); return 0; }
Last edited by ~s.o.s~; Oct 8th, 2006 at 5:22 pm. Reason: Learn to use code tags, i wont do it everytime.
In general, you have to read all three colums, and just igore the first 2.
The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
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Join Date: Aug 2005
Posts: 15,366
Reputation:
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>>char wksales[rows][columns];
you did not change this like I suggested. wksales can NOT be a 2d array of characters. The instructions say you need a 1d array of ints.
above is useless crap. you may as well delete it.
you did not change this like I suggested. wksales can NOT be a 2d array of characters. The instructions say you need a 1d array of ints.
C++ Syntax (Toggle Plain Text)
C++ Syntax (Toggle Plain Text)
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