Segmentation Fault in a brief amount of code

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You are using the C99 variable length array feature to define the size of end_matrix. Unfortunately, row_num and col_num are both zero, meaning neither “dimension” has any storage allocated. When you attempt to write into the array, because no storage was reserved for it, you are writing past the end and triggering undefined behavior that is manifesting as a segfault.

It looks like you have row_max and col_max defined as constants; perhaps you meant to use those instead of row_num and col_num when defining end_matrix.

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