Print selected column in files

Question

I have a file consist of 6 columns of data. I would like to retrieve the second and the last last three data. The last three data need to be stored in a 3 dimension array,

Here is example of the data in files:

gly  1 A 12.11 13.14 14.14
asp 2 A 13.23 24.64 35.25
glu 3  B  32.45 11.45 54.86

Use `fgets` to read each line. Use `sscanf` to parse each line. See [this](https://stackoverflow.com/a/36731485/3386109) for example. — user3386109, May 20 '16 at 17:23
Are you really sure you want a 3 dimension array? Each line has three items of data to put in an array, but whether 3, 4, or 10 items, I make that a 2 dimension array. What have you tried? — Weather Vane, May 20 '16 at 17:49
because the last three data is the coordination of the atom in 3d. so i want to store the coordination for all atom in an array — zzprog, May 20 '16 at 22:43

score 1 · Accepted Answer · answered May 20 '16 at 17:51

Read each line with your preferred function (fgets, fscanf, ...) and parse the line with sscanf.

char buffer[50];
char token1[15];
int token2;
char token3;
float token4, token5, token6;

while(fgets(buffer, 49, file)) {
    sscanf(buffer, "%s %d %c %f %f %f", token1, &token2, &token3, &token4, &token5, &token6);
    ...
}

Also, be careful with the return value of sscanf.

Print selected column in files

1 Answers1