小型科学计算器的设计与实现本科毕业论文

小型科学计算器的设计与实现

沈阳航空航天大学毕业设计（论文）

摘 要

随着计算机的飞速发展，人类已经进入信息化时代。信息技术发展日新月异,计算机已经进入人们生活的各个领域,在现代生活中不可或缺，大型复杂的计算是人脑所不能胜任的，而且较易出错。而以前的计算器只能进行十进制的四则运算，不能满足我们的需求。本文针对小型科学计算器进行研究，增加了很多功能，给用户带来了很多方便，并且提高了用户的运算效率。

本文从项目背景、需求分析、软件设计、系统实现、系统调试等方面详细说明了小型科学计算器的开发设计过程。软件采用vs2008编写代码，Qt designer设计界面来开发。计算器包含简单的四则运算、复杂的数学表达式运算、正弦和余弦运算、进制之间的相互转换、按键帮助等功能。

计算器具有界面可视化，方便用户操作等特点，并且该计算器的算式提取与存储功能使得算式计算更加快捷方便，为用户进行大量复杂科学计算提供了有效保证。

关键词：科学计算器；进制转换；算式提取； Qt designe

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沈阳航空航天大学毕业设计（论文）

Abstract

Because of the calculator which is flying quickly, the mankind have

already entered into information-based ages. The development of the information technique is changing with each passing day. the calculator has already entered each realm of the people’s life,which is very important in the modern times. the large and complicated calculation which is not competent for person's brain, which is possible to make many mistakes . The calculator only decimal four operations，The calculator can not meet our needs. This paper studied the small scientific calculator，Increased a lot of functions，To give users a lot of convenience, and improves the user's operation efficiency.

This article through the project background, requirement analysis, software design, system realization, system debugging to design calculator. This article through the VS2008 code, Qt designer interface design to develop. The calculator includes a simple four operations, complex mathematical expression operation, sine and cosine computation, hexadecimal conversion between, key help functions, with a visual interface, easy to operate.

This paper introduces the functions of the calculator and the effect of operation, the calculator with a visual interface, convenient operation, the calculator can be carried out calculation formula, the calculator convenient than before. Also commonly used formula extraction and storage, convenient for users to use. With the help of functional, user can quickly learn to operate.

Keyword: Hexadecimal， Demand analysis， extraction， expression

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沈阳航空航天大学毕业设计（论文）

目 录

1 绪论 ................................................................................................................................... 1 1.1 项目背景 .................................................................................................................... 1 1.2 项目内容和要求 ........................................................................................................ 2 1.2.1 题目介绍 .............................................................................................................. 2 1.2.2 题目要求 .............................................................................................................. 2 1.3 项目特点及意义 ........................................................................................................ 3 2 需求分析 ........................................................................................................................... 4 2.1 功能需求 .................................................................................................................... 4 2.2 功能分析 .................................................................................................................... 4 2.3 安全性分析 ................................................................................................................ 5 2.4 可行性分析 ................................................................................................................ 6 2.5 系统设计工具 ............................................................................................................ 6 2.5.1 Visual studio 2008技术简介 ................................................................................ 6 2.5.2 QSqlite数据库技术.............................................................................................. 7 3 软件设计 ......................................................................................................................... 10 3.1 数据库设计 .............................................................................................................. 10 3.1.1 实体属性图 ........................................................................................................ 10 3.1.2关系模型设计 ..................................................................................................... 11 3.1.3数据库结构设计 ................................................................................................. 11 3.2系统功能模拟设计 ................................................................................................... 12 3.2.1普通计算功能 ..................................................................................................... 12 3.2.2科学计算功能 ..................................................................................................... 12 3.2.3时间功能 ............................................................................................................. 13 3.2.4算式提取功能 ..................................................................................................... 13 3.2.5清空功能 ............................................................................................................. 14 3.2.6删除功能 ............................................................................................................. 14 3.2.7帮助功能 ............................................................................................................. 14

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