CODEWITHSUNDEEP
c++arraysfilefile-iomultidimensional-array
user3902496
user3902496

Reputation:

2D Array and File Handling [C++]

Background:

I'm attempting to read through a 2d array and find values that coincide with row numbers and column numbers.

Question:

How do I read values off a file and acquire, for example, 1 and 4 vs. 14?

Here's what I have so far...

All constructive criticism is welcome. 

int arrayOfNum[5][5] = {
    {34,21,32,41,25},
    {14,42,43,14,31},
    {54,45,52,42,23},
    {33,15,51,31,35},
    {21,52,33,13,23}};

ofstream arrayFile;
arrayFile.open("arrays.txt");

if (arrayFile.is_open()) {
    cout << "File opened successfully..." << endl;
}

for (int i = 0; i <= 4; i++) {

    arrayFile << endl;

    for (int j = 0; j <= 4; j++) {

        arrayFile << arrayOfNum[j][i] << ' ';
    }
}

Upvotes: 0

Views: 647

Answers (1)

Ali Mohyudin
Ali Mohyudin

Reputation: 242

You are writing rows in columns as you wrote "arrayOfNum[j][i]", but I'm writing the code for correct direction. You can change the condition in following code but it's working perfect if you write "arrayOfNum[i][j]" while outputting in 'array.txt'

ifstream arrayFile;
arrayFile.open("arrays.txt");
for (int i = 0; i <= 4; i++)
{
    for (int j = 0; j <= 4; j++)
    {
        arrayFile >> arrayOfNum[i][j];
        cout<<arrayOfNum[i][j]<<" ";
        if(i+1 == arrayOfNum[i][j] / 10 && j+1 == arrayOfNum[i][j] % 10)
        {
            cout<<"\n Matched: "<<arrayOfNum[i][j]<<endl;
        }
    }
    cout<<endl;
}

And yes it will work for only 2 digit numbers, if you want for N digit numbers then I can do it for you too! :)

Upvotes: 1

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