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FILE *fp;

fp=fopen(argv[1],"r");
You never checked to see if fp is NULL. What if that file doesn't exist?

Regards,

Also, your code has a memory leak:


read_test_off_file=new double[number_of_lines];
Where is the delete[] for this call to new[]?

But in general, coding like this in this day and age of C++...

And what about this erroneous line?


argv[2]=input_file_name.c_str();
Did you change that to not modify argv[2]?

Regards,

Paul McKenzie

First, use code tags when posting code. The code you posted is practically unreadable.

Second, you should not be attempting to change argv[] directly. Just copy the values of argv[] to your own...