汇编语言-计算总平成绩

计算总评成绩

题目：从键盘输入一同学的期中成绩、实验成绩、期末成绩和它们在总评成绩中分别占的百分比，计算得到该同学的总评成绩，并显示出来。

要求：该程序提示输入3个成绩和所占百分比。可参考如下的例子显示：

grade 1 ? 85

percent 1 ? 20

grade 2 ? 75

percent 2 ? 20

grade 3 ? 82

percent 3 ? 60

score is : 81

总评成绩 ＝ (期中成绩×百分比1＋实验成绩×百分比2＋期末成绩×百分比3)/100

; Example assembly language program --
; Author:  karllen
; Date:    revised 5/2014

.386
.MODEL FLAT

ExitProcess PROTO NEAR32 stdcall, dwExitCode:DWORD

INCLUDE io.h            ; header file for input/output

cr      EQU     0dh     ; carriage return character
Lf      EQU     0ah     ; line feed

.STACK  4096            ; reserve 4096-byte stack

.DATA
promot1_1 BYTE "grade   1 ?  ",0
promot1_2 BYTE "percent 1 ?  ",0
promot2_1 BYTE "grade   2 ?  ",0
promot2_2 BYTE "percent 2 ?  ",0
promot3_1 BYTE "grade   3 ?  ",0
promot3_2 BYTE "percent 3 ?  ",0

value     BYTE 11 DUP(?)
onec      DWORD  ?
twoc      DWORD  ?
threec    DWORD  ?

answer    BYTE "score is: "
average   BYTE 11 DUP(?)
BYTE cr,Lf,0
.CODE
_start:
output   promot1_1    ;enter first grade and percent
input    value,11
atod     value
mov      onec,eax
mov      ebx,eax
output   promot1_2
input    value,11
atod     value
mul      ebx          ;calculate first grade*percent
mov      onec,eax

output   promot2_1    ;enter second grade and percent
input    value,11
atod     value
mov      twoc,eax
mov      ebx,eax
output   promot2_2
input    value,11
atod     value
mul      ebx          ;calculate second grade*percent
mov      twoc,eax

output   promot3_1    ;enter the third grade and percent
input    value,11
atod     value
mov      threec,eax
mov      ebx,eax
output   promot3_2
input    value,11
atod     value
mul      ebx          ;calculate the third grade and percent
mov      threec,eax

add      eax,onec     ;to calculate sum
add      eax,twoc
add      eax,threec

mov      ebx,100
div      ebx          ;to calculate the average

dtoa     average,eax
output   answer

INVOKE  ExitProcess, 0  ; exit with return code 0

PUBLIC _start                   ; make entry point public

END                             ; end of source code

测试