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Unformatted Input Functions The istream class defines a rich collection of unformatted input functions. Several versions of the get () function are defined by the istream class. In its simplest form, it has no arguments and simply returns the next character in the input stream. Its function prototype is int get ();. This version of the function is typically used in an input loop as shown by the following fragment: char c; while ((c=cin.get()) !=EOF) cout <<c; cout <<endl; What is in a name What is in a name I don't know! I don't know! ^D Each call of the cin. get () function reads one more character from cin and returns it to the variable c. Then the statement inside the loop inserts c into the output stream. These characters accumulate in a buffer until the endof-line character is inserted. Then the buffer is flushed, and the complete line is printed just as it had been read. The expression (c=cin.get()) returns a value that is compared with the integer constant EOF. As long as they are unequal, the loop continues. When the end-of-file character ^D is read, cin. get() returns the value of EOF (usually -1), thereby terminating the loop. Another form of the get () function reads the next character from the input stream into its reference char parameter: istream& get(char& c); This version returns false when the end of file is detected, so it can conveniently be used to control an input loop. The previous loop control could be equivalently rewritten: while (cin.get(ch)) A third form of the get () function is similar to the getline () function. Its prototype is istream& get (char* buf, int n, char delim='\n'); This reads characters into buf until either n-1 characters are read or the de delim character is encountered, whichever comes first. It does not extract delim from the input stream. The getline () function is almost the same as the third form of the get () function. The only difference is that it does extract the delimiter
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character from the input stream but does not store it in the buf. Its prototype is istream& getline(char* buf, int n, char delim='\n'); The ignore() function is used to "eat" characters in the input stream. It simply extracts characters, without copying them into any variable. Its prototype is istream& ignore(int n=1, int delim=EOF); In its simplest form, cin. ignore () extracts one character from cin. More generally, cin. ignore (n) will extract n characters from cin, and cin. ignore (100000, ' $' ) would extract all the characters up to and including the next '$' character (or to the end of the file). Unformatted Output Functions The istream class defines functions for unformatted output that are analogous to unformatted input functions. The two versions of the put () function are the inverses of the corresponding get () functions: int put (char c); ostream& put(char c); They both insert the character c into the output stream. Example 12.3 Using the cout.put() Function This example shows the parallel nature of put() and get(): char c; while (cin.get(c)) cout.put(c); cout <<endl; The The But But ^D woods are lovely, dark and deep. woods are lovely, dark and deep. I have promises to keep, I have promises to keep,
The write () function has versions that are the inverses of the corresponding read functions: ostream& write(const char* buf, int n); ostream& write(const unsigned char* buf, int n); They both transfer n bytes from buf to the output stream.
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Stream Manipulators A stream manipulator is a special kind of stream class member function. When used with the insertion and extraction operators, they look like objects. They really are function calls. For example, cout <<endl; is actually a call to the stream manipulator function endl (). When operator<< is invoked, it is done so with a pointer pointing to the cout. endl() function. After printing the newline it returns a pointer to cout. So cout <<x <<y is actually processed as (cout <<x) <<y. After the cout <<x is processed it evaluates to a reference to cout which in turn evaluates cout <<y. The next example shows how you can write your own stream manipulator. Example 12.4 A ''Home-Grown'' Stream Manipulator ostrearn& Deep(ostrearn& ostr) { return ostr <<"\a"; } void main() { cout <<Deep; } When used as shown here, the stream manipulator sends the alert character '\ a' to the output stream which sounds the system beep. All stream manipulators work this way. They are defined with prototypes like this: ios& f(ios& ostr) ostream& f(ostream& ostr) istream& f(ostream& istr) or, in the case of manipulators with parameters, like this: ios& f(ios& ostr, int n) ostream& f(ostream& ostr, int n) istream& f(ostream& istr, int n) Table 12.1 lists of some of the more common stream manipulators. Table 12.1 Stream Manipulators Manipulator binary Stream ios Action Set stream mode to binary
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