CODEWITHSUNDEEP
carrays
user1377485
user1377485

Reputation: 13

Reading from .txt file into arrays in C?

I want to read each of the 4 columns stored in a .txt file separated by a space into an array of their own. The text file may have hundreds of rows so reading until the end of file is desirable.

Example:

3.4407280e+003 6.0117545e+003 8.0132664e+002 2.5292922e+003
3.4163843e+003 5.9879421e+003 7.7792044e+002 2.5058547e+003

so typically it would be array 1 containing all the rows from the first and most left column and so on.

Upvotes: 1

Views: 4588

Answers (1)

Richard J. Ross III
Richard J. Ross III

Reputation: 55533

fscanf is your friend:

static const int MAX_FILE_ROWS = 200;

double lines[MAX_FILE_ROWS][4];
FILE *file = fopen("myfile.txt", "r");

for (int i = 0; i < MAX_FILE_ROWS; i++)
{
    if (feof(file))
        break;

    fscanf(file, "%lf %lf %lf %lf", &(lines[i][0]), &(lines[i][1]), &(lines[i][2]), &(lines[i][3]));
}

fclose(file);

Then, lines should contain the data you need.

Upvotes: 2

Related Questions