Add 8 bit BCD numbers
Add 8 Bit BCD Numbers is the program written in assembly language and describes the algorithm of adding two 8 bit BCD numbers through Assembly program code. This program will take numbers as input one by one and then add those BCD numbers. You can find complete steps and algorithm below step by step.
Algorithm :
Step I : Initialize the data memory.
Step II : Get the first BCD number in AL.
Step III : Get the second BCD number in BL.
Step IV : Add the two BCD numbers.
Step V : Using DAA, adjust result to valid BCD number.
Step VI : Display the result.
Step VII : Stop.
Program :
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.model small <br/> .data <br/> a db 09H <br/> b db 02H <br/> .code <br/> mov ax, @data ; Initialize data section <br/> mov ds, ax <br/> mov al, a ; Load number1 in al <br/> mov bl, b ; Load number2 in bl <br/> add al, bl ; add numbers and result in al <br/> daa ; adjust result to valid BCD number <br/> mov ch, 02h ; Count of digits to be displayed <br/> mov cl, 04h ; Count to roll by 4 bits <br/> mov bh, al ; Result in reg bh <br/> rol bh, cl ; roll bl so that msb comes to lsb <br/> mov dl, bh ; load dl with data to be displayed <br/> and dl, 0fH ; get only lsb <br/> cmp dl, 09 ; check if digit is 0-9 or letter A-F <br/> jbe l4 <br/> add dl, 07 ; if letter add 37H else only add 30H <br/> add dl, 30H <br/> mov ah, 02 ; Function 2 under INT 21H (Display character) <br/> int 21H <br/> dec ch ; Decrement Count <br/> jnz l2 <br/> mov ah, 4cH ; Terminate Program <br/> int 21H <br/> end <br/> |
Source projectgeek.com
