小写字母变大写.asm

随机输入字符

DATAS SEGMENT
    ;此处输入数据段代码  
DATAS ENDS

STACKS SEGMENT
    ;此处输入堆栈段代码
STACKS ENDS

CODES SEGMENT
	MAIN PROC FAR
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    ;此处输入代码段代码
    PUSH DS
    XOR AX,AX
    PUSH AX
    MOV AH, 1H
    INT 21H
    CMP AL,61H
    JB EXIT
    CMP AL,7AH
    JA EXIT
   
    SUB AL,20H
    MOV DL,AL
    MOV AH,02H
    INT 21H
  	EXIT:RET
    MAIN ENDP
    
    
    
    
    
    
    MOV AH,4CH
    INT 21H
CODES ENDS
    END START