162.流的读写（Read and write in 162. streams）.docVIP

162.流的读写（Read and write in 162. streams） Is the external documents file stream input and output data flow, flow string not in external documents for input and output, and as a character array in memory user defined (string) as the object of the input and output of the data is output to the array of characters in memory, or from a character array (string) to read data. The string is also known as the memory stream flow. The string streams also have a corresponding buffer, at the beginning of the stream buffer is empty. If the stored data to a character array, with insert data stream, stream data in the buffer increases, until the buffer is full (or in the event of a newline), in the character array. If it is to read data from an array of characters, the first character in the array data to the stream buffer, and then extract the data from the buffer is assigned to the relevant variables. In the character array can be stored in character, can also store integers, floating point numbers and other data types. Before the deposit to the data array of characters to convert data from binary ASCII code, and then stored in the buffer, and then from the buffer to the character array. Read data from an array of characters, the first character in the array data to the buffer in the assigned to the variable before the ASCII code into binary form. In short, the flow of data format and character array buffer in the same. The file stream class ifstream, OFSTREAM and fstream, and string stream class istrstream, ostrstream and strstream. The file stream class and string stream class are ostream derived class istream and class iostream, so the operation method of them is basically the same. To a character in the memory array to write data to the file as the write data, but a little different: 1. output data not to external documents, but into a storage space in memory. Enter the storage space to read data from memory. 2. character stream object is not a file, but a character in the mem