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A segmentation fault occurs when an attempt is made to access a memory location that is out of bounds (for example a location that isn't mapped into the virtual address space for the process), or does not permit the access method being used (for example by writing to a readonly location).

Segmentation Faults in a C Program

Within a C program, a sementation fault usually occurs when an attempt is made to read from beyond the end of an array, or when you an attempt is made to dereference a pointer that's NULL or contains a garbage value (typically because an integer or typecast data has been written into a pointer).

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