Printing Hexadecimal Digits with Assembly [duplicate]

Answer 1

Intel Syntax. This is from my bootloader but you should be able to get the idea.

print_value_of_CX:

    print_value_of_C_high:

        print_value_of_C_high_high_part:
            MOV AH, CH
            SHR AH, 0x4
            CALL byte_hex_printer

        print_value_of_C_high_low_part:
            MOV AH, CH
            SHL AH, 0x4
            SHR AH, 0x4
            CALL byte_hex_printer

    print_value_of_C_low:

        print_value_of_C_low_high_part:
            MOV AH, CL
            SHR AH, 0x4
            CALL byte_hex_printer

        print_value_of_C_low_low_part:
            MOV AH, CL
            SHL AH, 0x4
            SHR AH, 0x4
            CALL byte_hex_printer

byte_hex_printer:
    CMP AH, 0x00
    JE move_char_for_zero_into_AL_to_print
    CMP AH, 0x01
    JE move_char_for_one_into_AL_to_print
    CMP AH, 0x02
    JE move_char_for_two_into_AL_to_print
    CMP AH, 0x03
    JE move_char_for_three_into_AL_to_print
    CMP AH, 0x04
    JE move_char_for_four_into_AL_to_print
    CMP AH, 0x05
    JE move_char_for_five_into_AL_to_print
    CMP AH, 0x06
    JE move_char_for_six_into_AL_to_print
    CMP AH, 0x07
    JE move_char_for_seven_into_AL_to_print
    CMP AH, 0x08
    JE move_char_for_eight_into_AL_to_print
    CMP AH, 0x09
    JE move_char_for_nine_into_AL_to_print
    CMP AH, 0x0A
    JE move_char_for_A_into_AL_to_print
    CMP AH, 0x0B
    JE move_char_for_B_into_AL_to_print
    CMP AH, 0x0C
    JE move_char_for_C_into_AL_to_print
    CMP AH, 0x0D
    JE move_char_for_D_into_AL_to_print
    CMP AH, 0x0E
    JE move_char_for_E_into_AL_to_print
    CMP AH, 0x0F
    JE move_char_for_F_into_AL_to_print

        move_char_for_zero_into_AL_to_print:
        MOV AL, 0x30
        CALL print_teletype_stringB
        RET
        move_char_for_one_into_AL_to_print:
        MOV AL, 0x31
        CALL print_teletype_stringB
        RET
        move_char_for_two_into_AL_to_print:
        MOV AL, 0x32
        CALL print_teletype_stringB
        RET
        move_char_for_three_into_AL_to_print:
        MOV AL, 0x33
        CALL print_teletype_stringB
        RET
        move_char_for_four_into_AL_to_print:
        MOV AL, 0x34
        CALL print_teletype_stringB
        RET
        move_char_for_five_into_AL_to_print:
        MOV AL, 0x35
        CALL print_teletype_stringB
        RET
        move_char_for_six_into_AL_to_print:
        MOV AL, 0x36
        CALL print_teletype_stringB
        RET
        move_char_for_seven_into_AL_to_print:
        MOV AL, 0x37
        CALL print_teletype_stringB
        RET
        move_char_for_eight_into_AL_to_print:
        MOV AL, 0x38
        CALL print_teletype_stringB
        RET
        move_char_for_nine_into_AL_to_print:
        MOV AL, 0x39
        CALL print_teletype_stringB
        RET
        move_char_for_A_into_AL_to_print:
        MOV AL, 0x41
        CALL print_teletype_stringB
        RET
        move_char_for_B_into_AL_to_print:
        MOV AL, 0x42
        CALL print_teletype_stringB
        RET
        move_char_for_C_into_AL_to_print:
        MOV AL, 0x43
        CALL print_teletype_stringB
        RET
        move_char_for_D_into_AL_to_print:
        MOV AL, 0x44
        CALL print_teletype_stringB
        RET
        move_char_for_E_into_AL_to_print:
        MOV AL, 0x45
        CALL print_teletype_stringB
        RET
        move_char_for_F_into_AL_to_print:
        MOV AL, 0x46
        CALL print_teletype_stringB
        RET