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n后问题回溯(递归) C/C++编写的n后问题回溯(递归) 欢迎大家使用，给大家带来愉快的心情-problems after n retrospective (recursive) C/C n prepared by the issue after backtracking (recursive) Everyone is welcome to use. give us some pleasant mood

数字图像放大缩小及旋转计算组间方差和组内方差的时候调用了一个函数专门求阈值，可能这里的计算还是有一点问题。而且在我的函数里，要256次调用这个函数，又因为计算机是按字节处理数据的，因此写图像数据的时候要用每8个写到一个数组中，然后通过计算得到字节类型的值，这些都使得我的算法效率比较低，最后一个问题，我觉得如果使用位运算会快一些，但是前面的问题还没有想到比较好的解决方法。-Digital Image zoom and rotation calculation of variances and group between the two groups when the variance of a function call seeking specific threshold, the calculation may be here, or there was a problem. And in my function, it is necessary 256 calls to this function, and also because the computer is processing data in bytes, and therefore the time to write image data to use for every 8 write an array, and then calculated byte type values, which are made to my algorithm" s efficiency is relatively low, the last issue, I think that if you use bit computing will be faster, but the previous issues have not yet thought of a better solution.

数学建模需要的基础知识，常用方法，及多种数学模型的总结说明-Mathematical modeling based on the needs of knowledge, common method, and a variety of mathematical model of the summary description

在VC下实现简单的3D图形绘制，含键盘操作-In VC to achieve a simple 3D graphics rendering, including keyboard operation

ISO/IEC 9899:1990 C编程标准。 1992年的TECHNICAL CORRIGENDUM 1-ISO/IEC 9899:1990 C programming standards. In 1992 the TECHNICAL a correr

上位机通信系统，通过串口实现对下位机的信息收集，并将信息保存到EXCEL中。-Host computer communication system, through the serial interface for the next crew of the information collection, and the information is saved to the EXCEL。

条形码商品管理信息系统 1.0 资源介绍: 适用于各类音像店和书店，可以帮助经营者完成进货、库存和售货的管理，还可以进行会员管理，使会员享受一定的折扣。经营者可以随时了解售货的情况，以及货物所处的位置，可以按照时间或物品种类统计经营利润。 使用与安装资料齐全。是不可多得的软件。 -barcode Commodity Management Information System 1.0 on resources : application to all types of audio and video shops and bookstores, and can help operators to complete the purchase, inventory and sales management can also be used for members of management and enjoying some discounts. Operators will be able to keep abreast of sales, and goods are located, according to the time or the types of statistical operating profits. The use and installation information becomes available. The software is rare.

用VC++实现图书管理系统，上传上来大家分享一下！-With VC++ Realize library management system, upload up everyone to share!

国简标准-软件文档模板-States SR standard-document template software

在ARM上构建嵌入式开发程序指导，介绍了嵌入式平台上用C 语言编写系统软件和应用软件的方法。虽然是针对ARM平台介绍的,但基本经验和算法也适合于其他嵌入式平台的软件设计。