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

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.

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)

Address | Data |
---|---|

… | … |

8000 | 03 |

8001 | 05 |

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 |

Address | Data |
---|---|

8002 | F3 |

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