; 实验三-4：成绩分类程序
; 功能：根据分数分类为A/B/C/D/E
; 90分以上为A，80-89为B，70-79为C，60-69为D，60分以下为E

DATA SEGMENT
    SCORE DB 85
    GRADE DB ?
DATA ENDS

CODE SEGMENT
    ASSUME CS:CODE, DS:DATA
START:
    MOV AX, DATA
    MOV DS, AX
    MOV AL, SCORE
    CMP AL, 90
    JAE A_GRADE
    CMP AL, 80
    JAE B_GRADE
    CMP AL, 70
    JAE C_GRADE
    CMP AL, 60
    JAE D_GRADE
    MOV GRADE, 'E'
    JMP EXIT
A_GRADE:
    MOV GRADE, 'A'
    JMP EXIT
B_GRADE:
    MOV GRADE, 'B'
    JMP EXIT
C_GRADE:
    MOV GRADE, 'C'
    JMP EXIT
D_GRADE:
    MOV GRADE, 'D'
EXIT:
    MOV AH, 4CH
    INT 21H
CODE ENDS
END START