排序，是重要的算法，qsort是标准库函数中快速排序方法，该文档包含的数值型、字符型、字符串型以及结构体的排序方法。内容比较全面。-Sort, is an important algorithm, qsort standard library functions quickly sort method, the document contains a numeric, character, string and sorting methods structure. Content more comprehensive.