8085 program to find the sum of series of even numbers

In this program we will see how to find the sum of all even numbers.

Problem Statement

Write 8085 Assembly language program to find sum of all even numbers stored in an array. The size of the array is stored at location F100; the numbers are stored from memory location F101 onwards. The result will be stored at F150.

Discussion

To check whether a number is odd or even, we can to AND operation. If a number is odd, then it will contain 1 as LSb, for even LSb will be 0. So after AND operation if the result is 0, then it is even. By using loop, we are adding the numbers only when it is even.

Input

Address	Data
. . .	. . .
F100	08
F101	0C
F102	0F
F103	0A
F104	0B
F105	02
F106	03
F107	05
F108	08
. . .	. . .

Flow Diagram

Program

Address	HEX Codes	Labels	Mnemonics	Comments
F000	3A, 00, F1		LDA F100	Load number of elements into A
F003	4F		MOV C,A	Load counter
F004	06, 00		MVI B,00	Clear B to store Sum
F006	21, 01, F1		LXI H,F101	Initialize pointer to take numbers
F009	7E	LOOP	MOV A,M	Take number from memory
F00A	E6, 01		ANI 01	Mask bits to check even or not
F00C	C2, 12, F0		JNZ SKIP	If it is not zero, skip it
F00F	78		MOV A,B	Load B to A
F010	86		ADD M	Add A and memory element
F011	47		MOV B,A	Store A to B
F012	23	SKIP	INX H	Point to next location
F013	0D		DCR C	Decrease Counter
F014	C2, 09, F0		JNZ LOOP	Until Z = 1, jump to LOOP
F017	32, 50, F1		STA F150	Store result
F020	76		HLT	Terminate program