What is the following code piece?

The code initializes each of the 10 cells in the array b to 0. It then uses a for loop to replace each of those cells with a 1.

The 10 cells are addressed as b[0]...b[9]. However, the index used to address the array elements is allowed to reach 10, and b[10] does not exist. If the environment in which the program is running includes safety checks, the program will terminate abnormally (also referred to as dumping, aborting, coring, trapping, or getting killed). If there's no error checking, the program will corrupt the memory location associated with b[10], which could be the location of another variable. In a non-trivial program, this usually results in mysteriously incorrect behavior that can very hard to debug.