Question

我正在尝试在LC3中创建一个程序，要求用户输入一个字符串并继续将其打印出来。我的程序只能打印出用户输入的字符串中的第一个字母。例如，我输入＆＃34; Hello＆＃34;它只打印出来＆＃34; H＆＃34;。有没有办法来解决这个问题？感谢

.orig   x3000
Lea r1, storeString

Lea r0, EnterText
puts

LOOP
getc

str r0, r1, 0
add r1, r0, -10
brz OUTSIDE

out
brnzp LOOP

OUTSIDE

Lea r0, UserEnter
puts

Lea r0, storeString
puts

Halt
EnterText .stringz "\nPlease enter a text: "
UserEnter .stringz "\nThe text you have typed is: "
storeString .BLKW 99

.end

Answer 1

学习使用调试器。你在行检查结束时覆盖LOOP getc str r0, r1, 0 add r1, r1, 1 ; next character add r0, r0, -10 ; just subtract in place brz OUTSIDE out brnzp LOOP（这是你的指针），实际上你应该将它递增1，因此它指向下一个字符的位置。你很幸运，这不只是爆炸。

这样的事情会更好：

create or replace TRIGGER addPhoneLine
AFTER INSERT ON phoneNumber
REFERENCING NEW AS NEW
  FOR EACH ROW

DECLARE
    primNum varchar(12);
    acctNum numeric(5);
    NEWusageID_new varchar(5);

BEGIN

    if :new.primaryNumber is not NULL then
        select acctID, primaryNumber into acctNum, primNum
        from account A
        where A.primaryNumber = :new.primaryNumber;

        select to_char(round(dbms_random.value(10000, 99999),0)) into 
NEWusageID_new from dual
        minus
        select usageID from usage;

        INSERT INTO acct_num VALUES
        (acctNum, primNum, :new.phonenumber);

        INSERT INTO phone_usage VALUES
        (NEWusageID_new, :new.phonenumber);
    end if;

END;

程序只会打印用户输入字符串的第一个字母

1 个答案: