Write a program that clears the screen and prompts the user to enter three signe

Question

Write a program that clears the screen and prompts the user to enter three signed integers: Enter Signed Integer: - Assign those values to val2, val3, and val4. - val1, val2, val3 and val4 are 32-bit memory signed integers - Pass those values to a subroutine that implements the following expression: val1 = (val2 + val3) * (val4 / val2) + (val3 * 3)

- To access the values in the caller frame, use EBP (remember EBP is created at the callee side). - The calculated expression result needs to be assigned to val1 at the caller side.

- The calculated expression result needs to be displayed on console screen from main subroutine. - Name the subroutine IntegerArithmeticProc.

- When calling or creating the IntegerArithmeticProc subroutine, you are not allowed to use any of the following directives: invoke, addr, proc with lists, and proto or proto with lists

- Use the appropriate multiplication and division instructions.

- Use the CBW, CWD, or CDQ instructions when needed.

- For (val3 * 3), you must use the instruction of the two operands format.

- Run your program using the debugger to verify your answers.

? Use Step Into instead of Step Over to keep track of the stack, ESP, EBP, EIP during debugging. ? To access the stack memory, copy the value of ESP from the register window and past it in the search text box in the memory window.

Explanation / Answer

DATA SEGMENT
msg1 DB "Enter Signed integers:"
val1 DW ?
val2 DW ?
val3 DW ?
val4 DW ?
CODE SEGMENT
mov ax,@data ;get data segment address
mov ds,ax ;initialize ds
;set the cursor position to the middle of the screen(25rowsx80columns)
MOV ah, 2
MOV bh, 1 ; page number
MOV dh, 12 ; middle row
MOV dl, 40 ; middle column
INT 10h
LEA DX, msg1 ; prompt user for input
MOV AH, 9
INT 21H
MOV ah, 1
INT 21h
MOV val2,AL
MOV ah, 2
INT 21h
MOV val3,AL
MOV ah, 3
INT 21h
MOV val4,AL
MOV EAX, val1 ; save final result in eax
; push parameters onto the stack from right to left
PUSHL val4
PUSHL val3
PUSHL val2
CALL IntegerArithmeticProc
STORE EAX, val1 ; Store final output in val1
IntegerArithmeticProc:
PUSH EBP
MOV EBP, ESP
MOV EBX, [EBP+8] ; EBX = val4
MOV ECX, [EBP+12] ; ECX = val3
MOV EDX, [EBP+16] ; EDX = val2
DIV EBX, EDX ; EBX = EBX/EDX = val4/val2
SUB EDX, ECX ; EDX = EDX-ECX = val2-val3
MULTI ECX, #3 ; ECX = ECX *3 = val3*3
MULTI EDX, EBX
SUB EDX, ECX
MOV EAX, EDX ; Final result in EAX
MOV ESP, EBP
POP EBP
RET ; Return

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