1 3 0 2 4
0 4 1 3 2
3 1 4 2 0
1 4 3 0 2
3 0 2 4 1
3 2 4 0 1
0 2 4 1 3
I have a matrix like this in a .txt file. Now, how do I read this data into a int** type of 2D array in best way? I searched all over the web but could not find a satisfying answer.
array_2d = new int*[5];
for(int i = 0; i < 5; i++)
array_2d[i] = new int[7];
ifstream file_h(FILE_NAME_H);
//what do do here?
file_h.close();
First of all, I think you should be creating an int*[] of size 7 and looping from 1 to 7 while you initialize an int array of 5 inside the loop.
In that case, you would do this:
array_2d = new int*[7];
ifstream file(FILE_NAME_H);
for (unsigned int i = 0; i < 7; i++) {
array_2d[i] = new int[5];
for (unsigned int j = 0; j < 5; j++) {
file >> array_2d[i][j];
}
}
EDIT (After a considerable amount of time):
Alternatively, I recommend using a vector or an array:
std::array<std::array<int, 5>, 7> data;
std::ifstream file(FILE_NAME_H);
for (int i = 0; i < 7; ++i) {
for (int j = 0; j < 5; ++j) {
file >> data[i][j];
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
int n;
fscanf(pFile, "%d", &n);
printf("(%d,%d) = %d\n", i, j, n);
array[i][j] = n;
}
I hope it helped.
