41 lines
710 B
NASM
41 lines
710 B
NASM
; 实验三-5：字符分类程序
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; 功能：判断大写/小写字母或其他字符
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; 结果：1=大写字母，2=小写字母，3=其他字符
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DATA SEGMENT
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CH DB 'A'
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RESULT DB ?
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DATA ENDS
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CODE SEGMENT
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ASSUME CS:CODE, DS:DATA
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START:
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MOV AX, DATA
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MOV DS, AX
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MOV AL, CH
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CMP AL, 'A'
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JNB NL_CHECK
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JMP OTHER
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NL_CHECK:
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CMP AL, 'Z'
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JNA UPLETTER
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CMP AL, 'a'
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JNB LL_CHECK
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JMP OTHER
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LL_CHECK:
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CMP AL, 'z'
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JNA LOWLETTER
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JMP OTHER
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UPLETTER:
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MOV RESULT, 1 ;大写字母
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JMP EXIT
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LOWLETTER:
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MOV RESULT, 2 ;小写字母
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JMP EXIT
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OTHER:
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MOV RESULT, 3 ;其他字符
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EXIT:
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MOV AH, 4CH
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INT 21H
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CODE ENDS
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END START |