That's sort of assembly code within a C program. The assignments are to store values in the processor registers and then call interrupt 0x10.
Interrupt 0x10 with the value 2 in register AH means to set the cursor position.
Register BH is the screen page (0 means the visible screen) and registers DH and DL are the x and y coordinates on the screen.
Have a look
here[
^] for information on interrupts and
here[
^] for information specifically about interrupt 10.