vs2017环境使用汇编语言实现统计字符串中空格和小写字母的个数

vs2017环境使用汇编语言实现分别统计字符串中空格和小写字母的个数

伪代码描述

space = lowercase = 0;
for i = 0 to n - 1 do
	if a[i] == ' ' then space++
	if('a' <= a[i] && a[i] <= 'z') then lowercase++;

汇编代码实现

include vcIO.inc

.data
    msg byte "hello, WORLD", 10, 0
	space dword ?
	lowercase dword ?
	frmStr byte "space num = %d, lowercase num = %d", 10, 0
.code
 main proc
	mov ecx, lengthof msg
	mov esi, offset msg
	sub eax, eax
	mov ebx, eax
again:
	mov dl, [esi]
	cmp dl, ' '
	jnz letter
	inc eax
letter:
	cmp dl, 'a'
	jb next			;if str[i] < 'a', jump to next
	cmp dl, 'z'
	jg next			;if str[i] > 'z', jump to next
	inc ebx
next: 
	inc esi
	loop again
   pushad
	invoke printf, offset frmStr, eax, ebx
   popad
	ret
	
 main endp
 end main

实验结果