To find the largest number in an array :-

Aim:

To find the largest number in an array of data using 8085 instruction set.

Algorithm :-

1. Load the address of the first element of the array in HL pair

2. Move the count to B – reg.

3. Increment the pointer

4. Get the first data in A – reg.

5. Decrement the count.

6. Increment the pointer

7. Compare the content of memory addressed by HL pair with that of A - reg.

8. If Carry = 0, go to step 10 or if Carry = 1 go to step 9

9. Move the content of memory addressed by HL to A – reg.

10. Decrement the count

11. Check for Zero of the count. If ZF = 0, go to step 6, or if ZF = 1 go to next step.

12. Store the largest data in memory.

13. Terminate the program.

Program :

         LXI H,4200 Set pointer for array
         MOV B,M    Load the Count
         INX H         Set 1st element as largest data
         MOV A,M
         DCR B          Decrements the count

 LOOP:  INX H
         CMP M           f A- reg > M go to AHEAD
         JNC AHEAD
         MOVA,M   Set the new value as largest

 AHEAD:DCR B
         JNZ LOOP     Repeat comparisons till count = 0
         STA 4300     Store the largest value at 4300
         HLT

Observation :-

Input: 05 (4200) ----- Array Size

Output: 0A (4201)
            F1 (4202)
           1F (4203)
            26 (4204)
            FE (4205)
            FE (4300)

Result :-

Thus the program to find the largest number in an array of data was executed.