Because everything you type will be stored in input buffer. It is like a queue of characters.
Input operation will take as much as they can (one non-whitespace character for char, up to first non-digit for ints, up until first whitespace for string, etc.), leaving the rest in that buffer. As soon as it is exhausted, you will be prompted to input next line. So if you provide enough info for several input oprations, they will run without interruption