Reference answer
assume cs:codeseg
dataseg segment
db "Beginner's All-purpose Symbolic Instruction Code.",0
dataseg ends
codeseg segment
start:
mov ax, dataseg
mov ds, ax
mov si, 0
call letterc
mov ax, 4c00H
int 21H
letterc:
push cx
push si
_letterc_start:
mov cl, ds:[si]; read the letters
mov ch, 0; determine whether the current character is zero
jcxz _letterc_end; if it is zero, directly end
cmp cl, 97; determine whether it is lowercase [97, 122]
jb _letterc_next_char; skip to
cmp cl, 122
ja _letterc_next_char
sub cl, 20H; convert letters to uppercase
mov ds:[si], cl
_letterc_next_char:
inc si
jmp short _letterc_start
_letterc_end:
pop si
pop cx
ret
codeseg ends
end start
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references
CSDN/Assembly Language Wang Shuang Third Edition Answers
Baidu Library/Assembly Language Experimental Answers (Wang Shuang)