计算函数值

1. 题目：计算给定函数值
2. 要求：编制程序，计算下面函数值
   

其中，从键盘输入x,y，输出数据为a。

输入输出时候都要求有提示信息。

考查知识点：分支结构的应用。

代码如下：

1 ; Example assembly language program --  2 ; Author:  karllen 3 ; Date:    revised 5/2014 4  5 .386 6 .MODEL FLAT 7  8 ExitProcess PROTO NEAR32 stdcall, dwExitCode:DWORD 9 10 INCLUDE io.h            ; header file for input/output11 12 cr      EQU     0dh     ; carriage return character13 Lf      EQU     0ah     ; line feed14 15 .STACK  4096            ; reserve 4096-byte stack16 17 .DATA18       promotX  BYTE "Please enter a number as X ",019       promotY  BYTE "Please enter a number as Y ",020       value    BYTE 11 DUP(?)21       answer   BYTE "The a is"22         rsa    BYTE 11 DUP(?)23                BYTE cr,Lf,024 .CODE25 _start:26       output   promotX       ;ebx = x27       input    value,1128       atod     value29       mov      ebx,eax30       31       output   promotY       ;eax = y32       input    value,1133       atod     value34       35       cmp      ebx,036       jl       lzero         ;ebx < 037       38       cmp      ebx,039       jg       oo            ;x>040       oo: 41            cmp eax,0 42            jl  oneg          ;y<043       cmp      eax,0         ;ebx>=044       jge      ltwozero      ;eax>=045      lzero:46            cmp    eax,047            jl     ltwzero      ;eax < 0    48      oneg:49            mov     eax,050            dtoa   rsa,eax51            output answer52            jmp    endCMP      53      ltwzero:54            mov    eax,155            neg    eax56            dtoa   rsa,eax57            output answer58            jmp    endCMP59      ltwozero:60            mov    eax,161            dtoa   rsa,eax62            output answer63      endCMP:64       65               INVOKE  ExitProcess, 0  ; exit with return code 066 67 PUBLIC _start                   ; make entry point public68 69 END                             ; end of source code

测试结果