采用指向指针的指针来动态分配二维数组，存储读取的文本结构内的数据。求得这二维数组内的行均值与协方差，并整齐输出，最后对所分配的内存进行释放！-Using a pointer to the pointer to dynamically allocated two dimensional array, storage read text structure within the data. Obtained in the two dimensional array of mean and covar

本程序实现从文本中读取字符串，统计该文本字符串中各字母出现的次数；另以colloc（）动态分配内存，实现文本指针的重新定位。-This procedure realize from the text read string, statistics the number of occurrences of each letter in the text string Another colloc () dynamically allocated memory, realize the text