Answer :
Final answer:
The code fails to compile because "CS 150" is const.
Explanation:
The code given will most likely crash when run. The reason is that the line s[0] = 'X'; tries to modify a string literal, which is not allowed in C++. String literals are treated as const pointers, and any attempt to modify them will result in undefined behavior.
If you want to modify the string, you should use an array of characters, like char s[] = "CS 150"; instead of a pointer to a string literal. This will create a writable copy of the string.
So, in this case, code fails to compile because "CS 150" is const.