1.简介 本程序是用纯C语言编的一个基于菜单命令行的数据库系统。可以创建多个数据库,数据库表,字段。其中字段的类型只能为整形,浮点型,字符型和字符串型(最大长度...
1.简介 本程序是用纯C语言编的一个基于菜单命令行的数据库系统。可以创建多个数据库,数据库表,字段。其中字段的类型只能为整形,浮点型,字符型和字符串型(最大长度确定,不能改变)。 2.功能 a)数据库存储: 一个数据库存储于一个文件中,打开文件将数据库载入到内存。 保存时将内存中数据重新写到文件中去。 b)数据库管理: 提供数据库的创建,表的创建,字段的创建 提供对数据的查询,删除,修改,排序功能 c)支持SQL部分语句: 支持SELECT 和DELETE语句-1. Introduction of this program is pure C language based on a series of menu command-line database system. You can create multiple databases, database tables, fields. The type field which can only plastic, floating point, character and string (maximum length and can not be changed). 2. A function) database storage : a database stored in a document, the document will open the database to include memory. When will preserve memory data re-wrote a document. B) database management : to provide database creation, table creation, the field for the creation of data inquiries, delete, modify, sequencing feature c) some support SQL statement : support DELETE and SELECT statements
- 2023-05-12 09:50:03下载
- 积分:1
能运算的函数: sin,cos,tg,ctg,e^,pow(x,y),cosh,sinh,tgh,log10,ln,sqrt,arcsin,arccos,...
能运算的函数: sin,cos,tg,ctg,e^,pow(x,y),cosh,sinh,tgh,log10,ln,sqrt,arcsin,arccos,
运算方式: +,-,*,/,绝对值(“[ ]”),^,!,
输入规则: 用键盘或按钮都可,输入完按回车运算,(光标要在最后)
sin(21-32)/(12-43)
4(323-4343) 4*(323-4343) e^2-sin3-3^4,(不要输入pow(3,4)) //有无*都可
2*3^4是(2*3)^4 而不是2*(3^4) 也就是要用x^y就要一定要(x^y)加上一个括号
[3-4]是求3-4的绝对值不是中括号 -performance computing functions : sin, cos, tg, rays, e ^, pow (x, y), cosh, sinh, tgh, log10, ln, sqrt, Simulation, arccos computational methods : absolute ,-,*,/, ( "[]"),^,!, importation rules : a keyboard or buttons which can be imported by the transport operator End (cursor to the final) sin (21-32)/(12-43) 4 (323-4343) 4* ( 323-4343), e ^ 2- KF-3 ^ 4 (do not enter pow (3,4))//* there can be 2* 3 ^ 4 is (2* 3) ^ 4 rather than 2* (3 ^ 4) was needed x ^ y must have (x ^ y) with a brackets [3-4] is the pursuit of 3-4 is not the absolute value of the brackets
- 2022-01-26 03:43:37下载
- 积分:1