What can cause segmentation faults in C++? [closed]

Answer 1

Trying to modify string literals:

char* mystr = "test";
mystr[2] = 'w';

This CAN cause segmentation fault.

Answer 2

Dereferencing NULL pointers.

#include <cstddef> //For NULL.
int* p1 = NULL; //p1 points to no memory address
*p1 = 3; //Segfault.

Answer 3

Forgetting to initialize pointers, leaving them with random memory addresses. Note: this may not always segfault, but it could.

int* p1; //No initialization.
*p1 = 3; //Possible segfault.