Grades indicator program help in assembly for AT89C51

Hello to all!

I am designing a project for my semester. It is very simplest and a part of it is to indicate which grade a student get. For example, if student's percentage is below 60% then it is "E" grade and P1.0 should go high. If student's percentage is in between 60% and 70% then it is "D" grade and P1.1 should go high. If student's percentage is in between 70% and 80% then it is "C" grade and P1.2 should go high. If student's percentage is in between 80% and 90% then it is "B" grade and P1.3 should go high and finally if student's percentage is above than 90% then it is "A" grade and P1.4 should go high.

I am stuck how to use code in assembly in order to declare the range, for example, for percentage between 60% and 70%? Means any value in between this will be the grade "D" and P1.1 will go high and and LED will show this as an indicator. So how to write this range in the assembly?

Thank you very much.

I need help. Is there anyone to help me?

Regards,
Princess

How input is fed?

Hello sir.

It is a long process sir. I mean I will use keyboard in order to feed the input in the form of percentage then an program inside the controller will recognize what percentage I have fed and correspondingly it will turn on the light on the port.

I just want to know how to tell controller the range of the of the percentage? Like if I were using the C language then it is easy to use the instruction like this,
if (percentage>60 && percentage<70) {printf" grade D"}.

How would I write the above statement in assembly language for 8051?

Either include 60 or 70 like this.
If you can code in C, compile it and see the generated assembly code. Write your assembly code using code lines from it.