What could be the reason for my C++ program, which runs perfectly till the end in debug mode on Eclipse CDT, to suddenly stop? The behavior seems peculiar.

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There could be several reasons for this behavior. Some possible reasons are:

1. Memory issues: If your program is using pointers or dynamic memory allocation, it may be causing memory leaks or segmentation faults. This may be more pronounced in debug mode as it may allow you to continue through certain issues, while release mode may cause your program to stop abruptly.

2. Undefined behavior: If your program has undefined behavior, such as accessing uninitialized or freed memory, it may run fine in debug mode due to certain settings or mechanisms in place, but may cause your program to suddenly stop in release mode.

3. Optimization: Optimization settings in release mode may cause your program to behave differently than in debug mode. This may lead to unexpected behavior, such as skipping over certain sections of code or optimizing out certain variables.

4. External dependencies: If your program relies on external libraries or code, there may be issues with compatibility or unexpected behavior that may lead to sudden stops or crashes.

It's important to properly diagnose the issue and identify the root cause before trying to fix it. This may involve using debugging tools, analyzing memory usage, reviewing code for undefined behavior or optimization issues, or troubleshooting external dependencies.