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January 26, 2012

Write a program to find Square of a given number

Written by @
Apparatus Used: Microprocessor, Keyboards
Assumption: The Square of a number can be calculated by adding consecutive odd numbers starting from 1. In order to find the square of 3, add three odd numbers starting from 1. 1 + 3 + 5 = 9.
To find the Square of 4, 1 + 3 + 5 + 7 = 16.
Algorithm:
  • Set the number who’s Square is to be calculated as the counter.
  • Get first odd number.
  • Clear the accumulator to store output.
  • Add first odd number to accumulator.
  • Get Second number and add to the accumulator and so on until counter is zero.
  • Store the output.
Program:
Memory Add
Mnemonics
Op-code
Comments
2000
LXI
H,2050 H
Location to store the number
2003
MOV
C,M
Save that number in Register C
2004
MVI
A,00 H
Store 00 to accumulator
2006
MVI
B, 01H
Get the First Odd Number
2008
ADD
B
Add the number to accumulator
2009
DCR
C
Decrement Counter
200A
INR
B

200B
INR
B
Get the next odd number
200C
JNZ
2008
Continue till counter =0
200F
STA
2052
Location to store output
2012
RST
5
Set the Break-point
2013
END

End the program

Description of used instruction:
LXI: This instruction is used to store the 16-bit data in the register pair designated in the operand.
MVI: This instruction is used to store 8 bit data in specified register.
MOV: This instruction is used to copy the content from source register to destination register.
ADD: This instruction is used to add the content of specified register to the content of accumulator and store output in accumulator.
INR: It will increment the content of specified register by one.
DCR: It will decrement the content of specified register by one.
JNZ: If result is not zero it will jump to the target address.
STA: This instruction is used to store the content of accumulator at specified memory address.
RST 5: This instruction is used to set break-point for the execution.
END: This instruction is used to execute the program.
Result:  
Input: 2050-04
Output: 2052-10
Procedure to look output
  • After press ENTER, You will get first screen
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide Input location for Input (M2050)
  • Press ENTER and Provide your Input at location (2050: 04)
  • Press SHIFT+4
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide address for output (M2052) and press ENTER
  • You will get your desired output.

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