汇编程序拒绝接受更多的程序 [英] Assembly program refuses to accept a larger number

问题描述

我正在尝试编写一个将Ulam的猜想应用于数字的程序.我的程序正在运行，但是它拒绝接受数字38836和38838.输入这些数字后，出现错误:再次尝试超出范围.堆栈为256，使用的变量为DW类型.我是组装的新手，所以如果我没有提供适当的信息，或者忽略了一些简单的内容，我深表歉意，但是我非常困惑.我认为这可能与我的问题有关.

I am trying to write a program that applies Ulam's conjecture to a number. I have the program working, however it refuses to accept the numbers 38836 and 38838. When these numbers are entered, it gives me the error: NUMBER OUT OF RANGE TRY AGAIN. The stack is at 256, and the variable used is a DW type. I am brand new to assembly and so I apologize if I did not include proper information, or am overlooking something simple, but I am very stuck. Here is what I think may be relevant to my problem.

            DOSSEG
            .MODEL  SMALL, BASIC, FARSTACK

            EXTRN   GETDEC:FAR
            EXTRN   NEWLINE:FAR
            EXTRN   PUTDEC:FAR
            EXTRN   PUTSTRNG:FAR

            .STACK  256


    .DATA
NUM           DW      ?
CNT           DW      0
PROMPT        DB      'Enter an integer: '
TOTAL         DB      'Number Total: '
FLOWMSG       DB      'OVERFLOW      '

       .CODE

ULAMS:                      
  MOV    AX,SEG DGROUP        
  MOV    ES,AX

    LEA      DI,PROMPT
    MOV      CX,18
    CALL     PUTSTRNG
    CALL     GETDEC

    MOV  NUM,AX
    MOV  CNT,0

    --->Rest of program cut for brevity<-----

推荐答案

如果GETDEC将输入的值放入16位寄存器AX中，则您无能为力，无法使GETDEC接受一个不包含该数字的数字.不适合16位寄存器.

If GETDEC puts the entered value in register AX, which is a 16-bit register, then there is nothing you can do to make GETDEC accept a number that doesn't fit in a 16-bit register.

您将不得不以其他方式输入如此大量的数字；例如，读取一个字符串并计算它代表的数字.

You'll have to fashion some other way of entering such large numbers; for example, reading in a string and computing the number it represents.

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