Question

In: Computer Science

a program that takes an integer and outputs the resulting factorial number.

assembly x86 language program

a program that takes an integer and outputs the resulting factorial number. 

Solutions

Expert Solution

1. address instructions   

0400 MOV CX, [0500] CX <- [0500]
0404 MOV AX, 0001 AX <- 0001
0407 MOV DX, 0000 DX <- 0000
040A MUL CX DX:AX <- AX * CX
040C LOOP 040A Go To [040A] till CX->00
0410 MOV [0600], AX [0600]<-AX
0414 MOV [0601], DX [0601]<-DX
0418 HLT Stop Execution
  1. MOV CX, [0500] loads 0500 Memory location content to CX Register
  2. MOV AX, 0001 loads AX register with 0001
  3. MOV DX, 0000 loads DX register with 0000
  4. MUL CX multiply AX with CX and store result in DX:AX pair
  5. LOOP 040A runs loop till CX not equal to Zero
  6. MOV [0600], AX store AX register content to memory location 0600
  7. MOV [0601], DX store DX register content to memory location 0601
  8. HLT stops the execution of program

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