在VC6.0环境下，用C实现串的基本操作：初始化串、求串长、比较两串大小、测试串是否为空、取子串、统计串中某子串个数等。文件中不仅包含源码 ，还包含一组测试结果。-At VC6.0 environment, using C string realize the basic steps: initialization string, and string length, comparing two strings of size, to test whether the string is empty, check substring, statistical series in a number of such substring. Document not only contains the source code, but also contains a set of test results.