Question

Write a MASM program that uses a loop to multiply 2 numbers. Use the equal sign directive to define the two numbers. Save the product in the EAX register.

Hint

4 x 5 = 4 + 4 +4 + 4 + 4 = 5 + 5 + 5 + 5

Language (Assembly)

ASAP

Answer 1

Solution:-

The above task can be achieved using the load registers (LDR) and a loop to work around with the numbers.

The numbers can be represented as: (a) 4 = 00 00 00 04

(b) 5 = 00 00 00 05

Area prog, Code, readonly
Entry
Main                           ;Main block of the code
   LDR R1, VALUE1
   LDR R2, VALUE2
   MOV R0, #0x00000000

LOOP                           ;Loop to add the number '4' 5 times
   ADD R0, R0, R1               ;Logic is R0 = R0 + R1
   SUBS R2, R2, #1               ;This is used to decrement the loop value by 1
   BNE LOOP                   ;This command will check the R2 till it gets R2 = 0
  
   MOV EAX, R0                   ;Move the value in R0 to EAX
  
Area prog, data, readonly       ;Initializing the data in here
VALUE1 = 00000004               ;VALUE1 is initialize as 4
VALUE2 = 00000005               ;VALUE2 is initialize as 5
END                               ;End the program

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