[SOLVED] C++ Read in from file into strings and arrays

lk181 · 10-02-2011, 07:32 PM

Okay so I took Intro to C++ and I was really good at it but that was a year ago. Right now I need to recreate a file header.

Title Card Required mo=5
Alpha MO coefficients
-3 -4.970736 -4.970736 -4.736883
31 0.333333 0.000000 0.000000
31 0.000000 0.333333 0.000000
31 0.000000 0.000000 0.333333
8 8.000000 0.000000 0.000000 0.233853
1 1.000000 0.000000 1.492645 -0.935410
1 1.000000 0.000000 -1.492645 -0.935410
1 5

I need to set to take the absolute value of the -3 and set it equal to some int. Then take the three 31 values and set those equal to some other int. My problem is I'm reading it in from a file and I can't get the file to stop reading so that I can set the numbers equal to what I need.

Help please.

flamelord · 10-02-2011, 09:02 PM

I'm not sure I quite understand what your problem is. What do you mean by "I can't get the file to stop reading?"

Are you asking you you can read just the one number?

If that is the case there are a couple things you can do. If you are using a file stream (the object oriented way to do it), then you can read the number like so:

Code:

int val1;
fstream >> val1;

Secondly, you can use the fscanf function, like so:

Code:

#include <stdio.h>

int i;
...

fscanf( fid, "%d", &i);

thsis is how you would do it in c, but it works in c++ as well.

lk181 · 10-25-2011, 05:03 PM

thank you. I see that wasn't worded properly now but I fixed it.