8085 program to find nth power of a number

In this program we will see how to find nth power of a number.

Problem Statement

Write 8085 Assembly language program to find nth power of a number. The base is stored at location 8000H, and the exponent is stored at 8001H. Store the result at 8002H.

Discussion

In 8085, we cannot perform the multiplication operation directly. Here we are writing a subroutine to perform the multiplication by using repetitive addition. To perform nth power of a number, we have to multiply the number n times. The n value is used as a counter. If the base is 03H, exponent is 05H, then the result is F3H (243D)

Input

Address	Data
…	…
8000	03
8001	05

Flow Diagram

Program

Address	HEX Codes	Labels	Mnemonics	Comments
F000	21, 00, 80		LXI H,8000H	Initialize HL pair
F003	46		MOV B,M	Take Base to B
F004	23		INX H	Point to next location
F005	4E		MOV C,M	Take exponent to C
F006	16, 01		MVI D, 01H	Initialize D with 01H
F008	CD, 12, F0	LOOP	CALL MUL	Call the subroutine to multiply
F00B	0D		DCR C	Decrease C by 1
F00C	C2, 08, F0		JNZ LOOP	Jump to Loop
F00F	23		INX H	Point to next location
F010	72		MOV M,D	Store D into memory
F011	76		HLT	Terminate the program
F012	58	MUL	MOV E,B	Load B to E
F013	AF		XRA A	Clear accumulator to store result
F014	82	ML	ADD D	Add D to A
F015	1D		DCR E	Decrement E
F016	C2, 12, F0		JNZ ML	If Z = 0, jump to ML
F019	57		MOV D,A	Transfer contents of A to D
F01A	C9		RET	Return result