char p; p = hello; p0 = a; printfsp;

This code will result in a segmentation fault or undefined behavior.

The variable p is a pointer to a string literal "hello". String literals are stored in read-only memory, which means that attempting to modify them will result in a segmentation fault or undefined behavior.

In this code, the statement p[0] = 'a' attempts to modify the first character of the string literal, which is not allowed.

Therefore, the program may crash or produce unexpected results when executed.