Another really common one is that casting from void * to any other type doesn't require a cast in C, but it does in C++: #include <stdlib.h> int main()

Another really common one is that casting from void * to any other type doesn't require a cast in C, but it does in C++: #include <stdlib.h> int main() { int *foo = malloc(sizeof(int)); return 0; } That works in C, but not in C++. There's actually another subtle different in there that main() means "unspecified arguments" in C, and "no arguments" in C++. ("No arguments" in C would be main(void).) However, it's no longer commonly used that way in C, but casts from void * to other types is very common in C.