CODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKS START: MOV AX,DATAS MOV DS,AX MAIN: CALL LOP2 LEA DX,HINT_10 MOV AH,09H INT 21H SETCHOOSE: MOV AH,01H INT 21H MOV CHOOSE,AL CALL OUTPUTCRLF CMP CHOOSE,'3' JZ CALL3 CMP CHOOSE,'4' JZ CALL4 CMP CHOOSE,'5' JZ CALL5 CMP CHOOSE,'6' JNZ SETCHOOSE CALL3: CALL LOP3 JMP SETCHOOSE CALL4: CALL LOP4 JMP SETCHOOSE CALL5: CALL LOP5 JMP SETCHOOSE OUTPUT PROC MOV BP,SP MOV AX,[BP+2] MOV INDEX,0 OUTPUT2: CWD DIV TEN ADD DX,30H PUSH DX INC INDEX CMP AX,0 JZ OUTPUT3 JMP OUTPUT2 OUTPUT3: CMP INDEX,0 JZ OUTPUTEND POP DX MOV AH,02H INT 21H DEC INDEX JMP OUTPUT3 OUTPUTEND: RET 2 OUTPUT ENDP OUTPUTSPACE PROC MOV DX,20H MOV AH,02H INT 21H RET OUTPUTSPACE ENDP OUTPUTCRLF PROC LEA DX,CRLF MOV AH,09H INT 21H RET OUTPUTCRLF ENDP LOP5 PROC MOV SI,0 MOV CX,COUNT_3 DEC CX MOV BX,GRADE[SI] ADD AVERAGE,BX ADDSUM: ADD SI,2 MOV BX,GRADE[SI] ADC AVERAGE,BX LOOP ADDSUM LEA DX,HINT_9 MOV AH,09H INT 21H MOV AX,AVERAGE CWD DIV COUNT_3 PUSH DX PUSH AX CALL OUTPUT MOV DX,'.' MOV AH,02H INT 21H MOV CX,COUNT_6 POP AX DECIMAL: MUL TEN CWD DIV COUNT_3 PUSH DX PUSH AX CALL OUTPUT POP AX LOOP DECIMAL CALL OUTPUTCRLF RET LOP5 ENDP LOP4 PROC MOV COUNT_5,0 MOV SI,0 MOV CX,0 COMPARE2: MOV BX,SIXTY CMP GRADE[SI],BX JB ACCOUNT RETURN2: ADD SI,2 INC CX CMP CX,COUNT_3 JNZ COMPARE2 JZ END4 ACCOUNT: INC COUNT_5 JMP RETURN2 END4: LEA DX,HINT_8 MOV AH,09H INT 21H MOV AX,COUNT_5 PUSH AX CALL OUTPUT CALL OUTPUTCRLF RET LOP4 ENDP LOP3 PROC MOV CX,0 FIRST: MOV DI,0 INC CX CMP CX,COUNT_3 JZ OUTPUT_3 COMPARE: MOV BX,GRADE[DI] CMP BX,GRADE[DI+2] JB SWAP RETURN1: ADD DI,2 CMP COUNT_4,DI JZ FIRST JMP COMPARE SWAP: MOV AX,GRADE[DI+2] MOV GRADE[DI],AX MOV GRADE[DI+2],BX JMP RETURN1 OUTPUT_3: MOV CX,COUNT_3 MOV SI,0 OUTPUT0: MOV AX,GRADE[SI] PUSH AX CALL OUTPUT CALL OUTPUTSPACE ADD SI,2 DEC CX CMP CX,0 JNZ OUTPUT0 CALL OUTPUTCRLF RET LOP3 ENDP LOP2 PROC MOV CX,0 MOV SI,0 LEA DX,HINT_6 MOV AH,09H INT 21H INPUT: MOV AH,01H INT 21H CMP AL,0DH JZ SAVENUM CMP AL,' ' JZ SAVENUM MOV DL,AL MOV DH,0 PUSH DI PUSH DX CALL ISDIGITAL POP DX POP DI CMP FLAG_1,0 JZ INPUT MOV N,DX SUB N,30H MOV AX,NUM MUL TEN ADD AX,N MOV NUM,AX JMP INPUT SAVENUM: INC CX MOV BX,NUM MOV GRADE[SI],BX MOV NUM,0 ADD SI,2 CMP AL,0DH JZ END2 JMP INPUT END2: MOV COUNT_3,CX LEA DX,HINT_7 MOV AH,09H INT 21H RET LOP2 ENDP ISDIGITAL PROC MOV BP,SP MOV DI,[BP+2] ISBIGGER: CMP DI,'0' JB NONDIGITAL ISSMALL: CMP DI,'9' JBE DIGITAL JMP NONDIGITAL NONDIGITAL: MOV FLAG_1,0 CALL OUTPUTCRLF LEA DX,HINT_5 MOV NUM,0 MOV AH,09H INT 21H RET DIGITAL: MOV FLAG_1,1 RET ISDIGITAL ENDP MOV AH,4CH INT 21H CODES ENDS END START请用注释的形式为我逐句解释这篇代码的功能

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS

    ; 初始化数据段寄存器
    START: 
        MOV AX,DATAS 
        MOV DS,AX 

    MAIN: 
        ; 调用 LOP2 过程
        CALL LOP2 

        ; 输出提示信息
        LEA DX,HINT_10 
        MOV AH,09H 
        INT 21H 

    SETCHOOSE: 
        ; 获取用户输入
        MOV AH,01H 
        INT 21H 
        MOV CHOOSE,AL 

        ; 根据用户输入调用不同的过程
        CALL OUTPUTCRLF 
        CMP CHOOSE,'3' 
        JZ CALL3 
        CMP CHOOSE,'4' 
        JZ CALL4 
        CMP CHOOSE,'5' 
        JZ CALL5 
        CMP CHOOSE,'6' 
        JNZ SETCHOOSE 

    CALL3: 
        ; 调用 LOP3 过程
        CALL LOP3 
        JMP SETCHOOSE 

    CALL4: 
        ; 调用 LOP4 过程
        CALL LOP4 
        JMP SETCHOOSE 

    CALL5: 
        ; 调用 LOP5 过程
        CALL LOP5 
        JMP SETCHOOSE 

    OUTPUT PROC 
        ; 从栈中获取 AX 寄存器中的值
        MOV BP,SP 
        MOV AX,[BP+2] 

        ; 将 AX 中的数字转换成字符并输出
        MOV INDEX,0 
        OUTPUT2: 
            CWD 
            DIV TEN 
            ADD DX,30H 
            PUSH DX 
            INC INDEX 
            CMP AX,0 
            JZ OUTPUT3 
            JMP OUTPUT2 
        OUTPUT3: 
            CMP INDEX,0 
            JZ OUTPUTEND 
            POP DX 
            MOV AH,02H 
            INT 21H 
            DEC INDEX 
            JMP OUTPUT3 
        OUTPUTEND: 
            RET 2 
    OUTPUT ENDP 

    OUTPUTSPACE PROC 
        ; 输出一个空格
        MOV DX,20H 
        MOV AH,02H 
        INT 21H 
        RET 
    OUTPUTSPACE ENDP 

    OUTPUTCRLF PROC 
        ; 输出回车换行
        LEA DX,CRLF 
        MOV AH,09H 
        INT 21H 
        RET 
    OUTPUTCRLF ENDP 

    LOP5 PROC 
        ; 计算成绩平均值
        MOV SI,0 
        MOV CX,COUNT_3 
        DEC CX 
        MOV BX,GRADE[SI] 
        ADD AVERAGE,BX 
        ADDSUM: 
            ADD SI,2 
            MOV BX,GRADE[SI] 
            ADC AVERAGE,BX 
        LOOP ADDSUM 
        LEA DX,HINT_9 
        MOV AH,09H 
        INT 21H 

        ; 输出平均值
        MOV AX,AVERAGE 
        CWD 
        DIV COUNT_3 
        PUSH DX 
        PUSH AX 
        CALL OUTPUT 
        MOV DX,'.' 
        MOV AH,02H 
        INT 21H 

        ; 输出小数部分
        MOV CX,COUNT_6 
        POP AX 
        DECIMAL: 
            MUL TEN 
            CWD 
            DIV COUNT_3 
            PUSH DX 
            PUSH AX 
            CALL OUTPUT 
            POP AX 
        LOOP DECIMAL 

        ; 输出回车换行
        CALL OUTPUTCRLF 
        RET 
    LOP5 ENDP 

    LOP4 PROC 
        ; 查找成绩大于等于 60 分的人数
        MOV COUNT_5,0 
        MOV SI,0 
        MOV CX,0 
        COMPARE2: 
            MOV BX,SIXTY 
            CMP GRADE[SI],BX 
            JB ACCOUNT 
            RETURN2: 
                ADD SI,2 
                INC CX 
                CMP CX,COUNT_3 
                JNZ COMPARE2 
                JZ END4 
        ACCOUNT: 
            INC COUNT_5 
            JMP RETURN2 
        END4: 

        ; 输出人数
        LEA DX,HINT_8 
        MOV AH,09H 
        INT 21H 
        MOV AX,COUNT_5 
        PUSH AX 
        CALL OUTPUT 
        CALL OUTPUTCRLF 
        RET 
    LOP4 ENDP 

    LOP3 PROC 
        ; 排序并输出成绩
        MOV CX,0 
        FIRST: 
            MOV DI,0 
            INC CX 
            CMP CX,COUNT_3 
            JZ OUTPUT_3 
        COMPARE: 
            MOV BX,GRADE[DI] 
            CMP BX,GRADE[DI+2] 
            JB SWAP 
            RETURN1: 
                ADD DI,2 
                CMP COUNT_4,DI 
                JZ FIRST 
                JMP COMPARE 
        SWAP: 
            MOV AX,GRADE[DI+2] 
            MOV GRADE[DI],AX 
            MOV GRADE[DI+2],BX 
            JMP RETURN1 
        OUTPUT_3: 
            MOV CX,COUNT_3 
            MOV SI,0 
            OUTPUT0: 
                MOV AX,GRADE[SI] 
                PUSH AX 
                CALL OUTPUT 
                CALL OUTPUTSPACE 
                ADD SI,2 
                DEC CX 
                CMP CX,0 
                JNZ OUTPUT0 
            CALL OUTPUTCRLF 
            RET 
    LOP3 ENDP 

    LOP2 PROC 
        ; 输出提示信息
        MOV CX,0 
        MOV SI,0 
        LEA DX,HINT_6 
        MOV AH,09H 
        INT 21H 

    INPUT: 
        ; 获取用户输入
        MOV AH,01H 
        INT 21H 
        CMP AL,0DH 
        JZ SAVENUM 
        CMP AL,' ' 
        JZ SAVENUM 
        MOV DL,AL 
        MOV DH,0 
        PUSH DI 
        PUSH DX 
        CALL ISDIGITAL 
        POP DX 
        POP DI 
        CMP FLAG_1,0 
        JZ INPUT 
        MOV N,DX 
        SUB N,30H 
        MOV AX,NUM 
        MUL TEN 
        ADD AX,N 
        MOV NUM,AX 
        JMP INPUT 
    SAVENUM: 
        INC CX 
        MOV BX,NUM 
        MOV GRADE[SI],BX 
        MOV NUM,0 
        ADD SI,2 
        CMP AL,0DH 
        JZ END2 
        JMP INPUT 
    END2: 
        MOV COUNT_3,CX 
        LEA DX,HINT_7 
        MOV AH,09H 
        INT 21H 
        RET 
    LOP2 ENDP 

    ISDIGITAL PROC 
        ; 判断字符是否为数字
        MOV BP,SP 
        MOV DI,[BP+2] 
        ISBIGGER: 
            CMP DI,'0' 
            JB NONDIGITAL 
        ISSMALL: 
            CMP DI,'9' 
            JBE DIGITAL 
            JMP NONDIGITAL 
        NONDIGITAL: 
            MOV FLAG_1,0 
            CALL OUTPUTCRLF 
            LEA DX,HINT_5 
            MOV NUM,0 
            MOV AH,09H 
            INT 21H 
            RET 
        DIGITAL: 
            MOV FLAG_1,1 
            RET 
    ISDIGITAL ENDP 

    ; 程序结束
    MOV AH,4CH 
    INT 21H 
CODES ENDS 
END START

这段代码是一个简单的成绩管理程序，可以实现以下功能：

1. 输入成绩，最多输入 30 个，保存在数组 `GRADE` 中。
2. 对成绩进行排序并输出。
3. 计算成绩平均值，输出平均值及小数部分。
4. 查找成绩大于等于 60 分的人数，输出人数。

程序的具体实现细节可以参考注释。