30 lines
433 B
NASM
30 lines
433 B
NASM
; 实验三-7：符号函数程序
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; 功能：计算符号函数Y
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; Y = 1 (X>0), Y = 0 (X=0), Y = -1 (X<0)
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DATA SEGMENT
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X DW 5
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Y DW ?
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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 AX, X
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CMP AX, 0
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JG POSITIVE
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JL NEGATIVE
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MOV Y, 0
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JMP EXIT
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POSITIVE:
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MOV Y, 1
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JMP EXIT
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NEGATIVE:
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MOV Y, -1
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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 |