用汇编语言编写程序，统计某门课程考试成绩各分数段的人数，然后按照一定格式显示出总人数，各分数段人数及所占百分比。用子程序结构写

以下是用汇编语言编写程序，统计某门课程考试成绩各分数段的人数，然后按照一定格式显示出总人数，各分数段人数及所占百分比的代码，使用了子程序结构：

.MODEL SMALL
.STACK 100H

.DATA
    ; 定义考试成绩的数组
    SCORES DB 60, 70, 80, 90, 100

    ; 定义各分数段人数的变量
    UNDER60 DB ?
    BETWEEN60AND69 DB ?
    BETWEEN70AND79 DB ?
    BETWEEN80AND89 DB ?
    BETWEEN90AND100 DB ?

    ; 定义总人数、百分比的变量
    TOTAL DB ?
    PERCENT60 DB ?
    PERCENT70 DB ?
    PERCENT80 DB ?
    PERCENT90 DB ?
    PERCENT100 DB ?

    ; 定义输出格式的字符串
    MSG1 DB 'Total number of students: $'
    MSG2 DB 'Number of students under 60: $'
    MSG3 DB 'Number of students between 60 and 69: $'
    MSG4 DB 'Number of students between 70 and 79: $'
    MSG5 DB 'Number of students between 80 and 89: $'
    MSG6 DB 'Number of students between 90 and 100: $'
    MSG7 DB 'Percentage of students under 60: $'
    MSG8 DB 'Percentage of students between 60 and 69: $'
    MSG9 DB 'Percentage of students between 70 and 79: $'
    MSG10 DB 'Percentage of students between 80 and 89: $'
    MSG11 DB 'Percentage of students between 90 and 100: $'

.CODE
    MAIN PROC
        MOV AX, @DATA
        MOV DS, AX

        ; 初始化各分数段人数的变量
        MOV UNDER60, 0
        MOV BETWEEN60AND69, 0
        MOV BETWEEN70AND79, 0
        MOV BETWEEN80AND89, 0
        MOV BETWEEN90AND100, 0

        ; 统计各分数段人数
        CALL COUNT_SCORES

        ; 计算总人数和百分比
        CALL CALC_PERCENTAGE

        ; 输出结果
        CALL DISPLAY_RESULT

        MOV AH, 4CH
        INT 21H
    MAIN ENDP

    ; 统计各分数段人数的子程序
    COUNT_SCORES PROC
        MOV CX, 5 ; 考试成绩的数量
        MOV SI, OFFSET SCORES
        MOV BX, OFFSET UNDER60

        LOOP_START:
            CMP [SI], 60
            JB UNDER60_SCORE
            CMP [SI], 70
            JB BETWEEN60AND69_SCORE
            CMP [SI], 80
            JB BETWEEN70AND79_SCORE
            CMP [SI], 90
            JB BETWEEN80AND89_SCORE
            JMP BETWEEN90AND100_SCORE

        UNDER60_SCORE:
            INC BX
            JMP LOOP_END

        BETWEEN60AND69_SCORE:
            ADD BX, 2
            JMP LOOP_END

        BETWEEN70AND79_SCORE:
            ADD BX, 3
            JMP LOOP_END

        BETWEEN80AND89_SCORE:
            ADD BX, 4
            JMP LOOP_END

        BETWEEN90AND100_SCORE:
            ADD BX, 5

        LOOP_END:
            ADD SI, 1 ; 跳到下一个考试成绩
            LOOP LOOP_START

        RET
    COUNT_SCORES ENDP

    ; 计算总人数和百分比的子程序
    CALC_PERCENTAGE PROC
        MOV AL, UNDER60
        ADD AL, BETWEEN60AND69
        ADD AL, BETWEEN70AND79
        ADD AL, BETWEEN80AND89
        ADD AL, BETWEEN90AND100
        MOV TOTAL, AL

        MOV BL, 100
        DIV BL ; AL = 总人数，BL = 100
        MOV PERCENT60, AL

        MOV AL, BETWEEN60AND69
        ADD AL, BETWEEN70AND79
        ADD AL, BETWEEN80AND89
        ADD AL, BETWEEN90AND100
        MOV BL, TOTAL
        DIV BL ; AL = 60-100分数段的总人数，BL = 总人数
        MOV PERCENT70, AL

        MOV AL, BETWEEN70AND79
        ADD AL, BETWEEN80AND89
        ADD AL, BETWEEN90AND100
        MOV BL, TOTAL
        DIV BL ; AL = 70-100分数段的总人数，BL = 总人数
        MOV PERCENT80, AL

        MOV AL, BETWEEN80AND89
        ADD AL, BETWEEN90AND100
        MOV BL, TOTAL
        DIV BL ; AL = 80-100分数段的总人数，BL = 总人数
        MOV PERCENT90, AL

        MOV AL, BETWEEN90AND100
        MOV BL, TOTAL
        DIV BL ; AL = 90-100分数段的总人数，BL = 总人数
        MOV PERCENT100, AL

        RET
    CALC_PERCENTAGE ENDP

    ; 输出结果的子程序
    DISPLAY_RESULT PROC
        ; 输出总人数
        MOV AH, 9
        MOV DX, OFFSET MSG1
        INT 21H
        MOV DL, TOTAL
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        ; 输出各分数段人数
        MOV AH, 9
        MOV DX, OFFSET MSG2
        INT 21H
        MOV DL, UNDER60
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG3
        INT 21H
        MOV DL, BETWEEN60AND69
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG4
        INT 21H
        MOV DL, BETWEEN70AND79
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG5
        INT 21H
        MOV DL, BETWEEN80AND89
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG6
        INT 21H
        MOV DL, BETWEEN90AND100
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        ; 输出百分比
        MOV AH, 9
        MOV DX, OFFSET MSG7
        INT 21H
        MOV DL, PERCENT60
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, '%'
        INT 21H
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG8
        INT 21H
        MOV DL, PERCENT70
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, '%'
        INT 21H
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG9
        INT 21H
        MOV DL, PERCENT80
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, '%'
        INT 21H
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG10
        INT 21H
        MOV DL, PERCENT90
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, '%'
        INT 21H
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        MOV AH, 9
        MOV DX, OFFSET MSG11
        INT 21H
        MOV DL, PERCENT100
        ADD DL, 48
        INT 21H
        MOV AH, 2
        MOV DL, '%'
        INT 21H
        MOV DL, 0DH
        INT 21H
        MOV DL, 0AH
        INT 21H

        RET
    DISPLAY_RESULT ENDP
END MAIN

注释已经在代码中给出。