the file contains about 500 traverse points. each including and elevation northing easting backsight and forsight. so the file isnt way to big.

on your scanfs you have %.2lf not .2f. your trying to scan in a double.. not a float.. maybe thats the problem.. i didnt read the code over but thats something i saw quick.

Hello,

I am studying surveying and writing a program to help my needs. So far this program reads my input file and performs what i want by outputting it to another file. I then after displaying that information want to Re-read the same file into my while loop and perform some adjustment computations to it through Least Sqaures. The problem is when i try to reopen that file it will not work.

I have tryed fclose(in);...