disp(fprintf()) prints the fprintf and the number of characters. Why?

Question

By coincidence I discovered, that disp(fprintf()) prints the string of fprintf plus the number of characters that it has. I know, that the disp() i

Answer 1

In the doc on fprintf, you see that the output from fprintf is the number of bytes printed. So here, the fprintf is printing Hi 2 all of you and the disp is printing the 15 returned by fprintf.