尝试以汇编语言翻转三角形
[英]Trying to flip a triangle in assembly language
问题描述
INCLUDE Irvine32.inc
.code
main PROC
mov ecx, 6
L1:
call Proc1
call CRLF
loop L1
exit
main ENDP
proc1 PROC USES ecx
mov al, 'A'
L2: call WriteChar
inc al
loop L2
ret
proc1 ENDP
END main
The output of my code is 
我的代码的输出是
ABCDEF
ABCDE
ABCD
ABC
AB
A
In a triangle form going down but I need to flip it to where it is 以三角形形式下降，但我需要将其翻转到当前位置
A
AB
ABC
ABCD
ABCDE
ABCDEF
Edit: 编辑：
Trying to mirror the right triangle. 尝试镜像直角三角形。
A A
AB BA
ABC CBA
ABCD DCBA
ABCDE EDCBA
ABCDEF FEDCBA
2 个解决方案
解决方案1
1 已采纳 2016-05-09 20:54:23
As suggested by @Jester, counting up is the solution, but only in one loop (I made the little change in your code) : 正如@Jester所建议的那样，增加计数是一种解决方案，但只能在一个循环中进行（我对您的代码进行了很小的更改）：
INCLUDE Irvine32.inc
.code
main PROC
mov ecx, 1 ;<=============================
L1:
call Proc1
call CRLF
; loop L1 ;<============================= NO MORE LOOP HERE.
inc ecx ;<============================= CX++.
cmp ecx, 6 ;<=============================
jbe L1 ;<============================= IF (CX <= 6) REPEAT.
exit
main ENDP
proc1 PROC USES ecx
mov al, 'A'
L2: call WriteChar
inc al
loop L2
ret
proc1 ENDP
END main
The output now is : 现在的输出是：
A
AB
ABC
ABCD
ABCDE
ABCDEF
Now the mirror : the idea is to print blank spaces before the letters: 现在是镜像 ：想法是在字母前打印空格：
INCLUDE Irvine32.inc
.code
main PROC
mov ecx, 1 ;<=============================
mov ebp, 6 ;EBP IS USED AS REVERSE COUNTER FOR BLANK SPACES.
L1: call spaces ;</////////////////////////////
call Proc1
call CRLF
; loop L1 ;<============================= NO MORE LOOP HERE.
inc ecx ;<============================= CX++.
cmp ecx, 6 ;<=============================
jbe L1 ;<============================= IF (CX <= 6) REPEAT.
exit
main ENDP
proc1 PROC USES ecx
mov al, 'A'
L2: call WriteChar
inc al
loop L2
ret
proc1 ENDP
spaces PROC ;</////////////////////////////
push ebp ;PRESERVE CURRENT SPACES COUNTER.
mov al, ' ' ;SPACE TO PRINT.
L3: call WriteChar ;PRINT SPACE.
dec ebp ;DECREASE COUNTER.
jnz L3 ;IF COUNTER > 0 REPEAT.
pop ebp ;RESTORE SPACES COUNTER.
dec ebp ;DECREASE ONE SPACE FOR THE NEXT LINE.
ret ;</////////////////////////////
spaces ENDP ;</////////////////////////////
END main
TWO TRIANGLES : two triangles can be displayed just by calling "Proc1" before and after the spaces, and, very important, the spaces counter, "EBP", must be 12 (for appropiate separation) and, in proc "Spaces", EBP must decrease by 2 : 两个三角形 ：只需在空格前后调用“ Proc1”就可以显示两个三角形，非常重要的是，空格计数器“ EBP”必须为12（用于适当分隔），而在过程“空格”中则为EBP必须减少2：
INCLUDE Irvine32.inc
.code
main PROC
mov ecx, 1 ;<=============================
mov ebp, 12 ;EBP IS USED AS REVERSE COUNTER FOR BLANK SPACES.
L1: call Proc1 ;LEFT TRIANGLE ! ! !
call spaces ;</////////////////////////////
call Proc1 ;RIGHT TRIANGLE ! ! !
call CRLF
; loop L1 ;<============================= NO MORE LOOP HERE.
inc ecx ;<============================= CX++.
cmp ecx, 6 ;<=============================
jbe L1 ;<============================= IF (CX <= 6) REPEAT.
exit
main ENDP
proc1 PROC USES ecx
mov al, 'A'
L2: call WriteChar
inc al
loop L2
ret
proc1 ENDP
spaces PROC ;</////////////////////////////
push ebp ;PRESERVE CURRENT SPACES COUNTER.
mov al, ' ' ;SPACE TO PRINT.
L3: call WriteChar ;PRINT SPACE.
dec ebp ;DECREASE COUNTER.
jnz L3 ;IF COUNTER > 0 REPEAT.
pop ebp ;RESTORE SPACES COUNTER.
sub ebp, 2 ;DECREASE 2 SPACES FOR THE NEXT LINE.
ret ;</////////////////////////////
spaces ENDP ;</////////////////////////////
END main
解决方案2
1 2016-05-09 20:59:13
Alternate solution: 替代解决方案：
proc1 PROC USES ecx
neg ecx
add ecx, 7 ; print 7-ecx letters
mov al, 'A'
L2: call WriteChar
inc al
loop L2
ret
proc1 ENDP
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