how to display the results in ddd.d format?

and how to getting the remander? Please solve it in assembly language.

is using the expression x+y2xy Using the windows 32 framework, write a complete 8086 assembly language program to prompt for two numbers and then calculate and display their harmonic mean in ddd.d format. Hint: Multiply by 20 instead of 2 to get an extra digit. Then after you use the dtoa macro to convert the 10 -times-too-large number to ASCII, copy ( 1 byte at a time) the last four characters of the string to the string you will actually display. The string for display might be defined as: hMeanDut BYTE 3 DUP (?), ' ', ?, 0