Only in one direction. You can use char to access data that's really uint32_t, but you can't use uint32_t to access data that's really char. ("Really" here is

Only in one direction. You can use char to access data that's really uint32_t, but you can't use uint32_t to access data that's really char. ("Really" here is what the C standard calls "effective type"; for normal variables it's equivalent to the declared type, but for malloc'ed memory it has a weird definition where you can change the type by writing to it.)