具体过程:

一 用visual studio2022新建一个x86汇编项目

二 伪指令if() else()在x86汇编中的应用

entry.asm

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
include entry.inc

.code

printNumber proc Number:dword
	mov eax,Number
	push eax
	mov eax,offset szFormatd
	push eax
	call printf
	add esp,8
	ret
printNumber endp

main proc
	mov dwIndex,11
	.if dwIndex == 10
		mov dwNumber,10
		invoke printNumber,dwNumber
	.elseif dwNumber == 11
		mov dwNumber,11
        invoke printNumber, dwNumber
    .elseif dwIndex == 12
    	mov dwNumber,12
    	invoke printNumber, dwNumber
    .else
    	mov dwNumber,666
    	invoke printNumber,dwNumber
   .endif
	invoke ExitProcess,0
main endp
end

entry.inc

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
.586
.model flat,stdcall
	option casemap:none

include include/windows.inc
include include/User32.inc
include include/Kernel32.inc
includelib ucrt.lib
includelib User32.lib
includelib kernel32.lib
includelib legacy_stdio_definitions.lib

extern printf:proc
 
.data
szBuffer db"how you doing",0
dwIndex dd ?
szFormatd db "%d",0
dwNumber dd ?

三 伪指令.while在x86汇编中的应用

entry.asm

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
;entry.asm
include entry.inc

.code

printNumber proc Number:dword
	mov eax,Number
	push eax
	mov eax,offset szFormatd
	push eax
	call printf
	add esp,8
	ret
printNumber endp

main proc
	mov dwIndex,100
	.while dwIndex >0
	.if dwIndex == 50
		jmp lp
	.endif
	invoke printNumber,dwIndex
	LineFeed;调用宏用来换行
lp:
	dec dwIndex
	.endw
	invoke ExitProcess,0
main endp
end

entry.inc

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
;entry.inc
.586
.model flat,stdcall
	option casemap:none

include include/windows.inc
include include/User32.inc
include include/Kernel32.inc
includelib ucrt.lib
includelib User32.lib
includelib kernel32.lib
includelib legacy_stdio_definitions.lib

extern printf:proc
extern putchar:proc

LineFeed MACRO
	push 0dh
	call putchar
	push 0ah
	call putchar
	add esp,8
endm
 
.data
szBuffer db"how you doing",0
dwIndex dd ?
szFormatd db "%d",0
dwNumber dd ?

四 使用伪指令在x86汇编中输入打印文本

entry.inc

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
;entry.inc
.586
.model flat,stdcall
	option casemap:none

include include/windows.inc
include include/User32.inc
include include/Kernel32.inc
includelib ucrt.lib
includelib User32.lib
includelib kernel32.lib
includelib legacy_stdio_definitions.lib

extern printf:proc
extern scanf:proc
extern putchar:proc
extern getchar:proc

LineFeed MACRO
	push 0dh
	call putchar
	push 0ah
	call putchar
	add esp,8
endm
 
.data

szBuffer db"how you doing",0
dwIndex dd ?
szFormatd db "%d",0
szFormats db "%s",0
szFormatc db "%c",0
dwNumber dd ?
nChar db ?
szText1 db "Input Number:",0
szText2 db "input Operator:",0
dwNumber1 dd ?
dwNumber2 dd ?

entry.asm

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
;entry.asm
include entry.inc

.code
printText proc String:dword
	mov eax,String
	push eax
	mov eax,offset szFormats
	push eax
	call printf
	add esp,8
	ret
printText endp

printNumber proc Number:dword
	mov eax,Number
	push eax
	mov eax,offset szFormatd
	push eax
	call printf
	add esp,8
	ret
printNumber endp

scanfNumber proc Number:dword
	mov eax,Number
	push eax
	mov eax,offset szFormatd
	push eax
	call scanf
	add esp,8
	ret
scanfNumber endp

scanfByte proc
	mov eax,offset nChar
	push eax
	mov eax,offset szFormatc
	push eax
	call scanf
	add esp,8
	ret
scanfByte endp

radd proc num1:dword,num2:dword
	xor eax,eax
	add eax,num1
	add eax,num2
	ret
radd endp

rsub proc num1:dword,num2:dword
	xor eax,eax
	add eax,num1
	add eax,num2
	ret
rsub endp

main proc
	invoke printText,offset szText1
	invoke scanfNumber,offset dwNumber1
	call getchar
	invoke printText,offset szText2
	invoke scanfByte
	invoke printText,offset szText1
	invoke scanfNumber,offset dwNumber2
	.if nChar =='+'
		invoke radd,dwNumber1,dwNumber2
		invoke printNumber,eax
	.elseif nChar == '-'
		invoke rsub,dwNumber1,dwNumber2
		invoke printNumber,eax
    .endif
	invoke ExitProcess,0
main endp
end