Weird error when reading a large .txt file in c++ [duplicate]

Answer 1

float* hu_geometry = new float(dim);
int* hu_temp = new int(dim);

those are 1-char arrays containing the value dim. At some point you're hitting a MMU boundary and crashes randomly.

You want to write:

float* hu_geometry = new float[dim];
int* hu_temp = new int[dim];

or maybe better with vectors, pre-allocated with dim elements

#include 
std::vector hu_geometry(dim);
std::vector hu_temp(dim);

or not allocated at start:

std::vector hu_temp;

and in your code:

hu_temp.push_back(stoi(line));

(hu_temp.size() gives the size and a lot of very nice features better described here)