Process finished with exit code -1073741819 (0xC0000005) - C, CLion But There Is Nothing Wrong With the Output

Question

I've done a project in which I needed to calculate the multiplications of very large numbers using LinkedList. However, even though I get the right answers I got an error message.

Process finished with exit code -1073741819 (0xC0000005)

This happens whenever one of the numbers is really large. I've looked at old posts but I couldn't find anything similar to my situation.

Here are the example outputs.

Example with error code Example without error code

I store the numbers in a LinkedList as digits. So, every node has a digit and there shouldn't be any issue about int/long thing I guess but I couldn't find what makes this. When I debug the code, I get the error pointer at the end of the code, where there is no code. Debug

I hope I explained my problem properly, thanks in advance.

Answer 1

The error code 0xC0000005 means "access violation" in Microsoft Windows, which is the equivalent of a Linux "segmentation fault".

The problem is probably the following code:

char num1[] = "";

[...]

printf( "Num1: " );
gets( num1 );

This will cause a buffer overflow if the user enters anything more than an empty line. That is because the array num1 only has room for a single character (which is already needed for the null terminating character).

I suggest that you use the following code instead:

char num1[100];

[...]

printf( "Num1: " );
fgets( num1, sizeof num1, stdin );

The code related to num2 has the same problem.

I strongly suggest that you read this:

Why is the gets function so dangerous that it should not be used?