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CHAP. 121
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STREAM I/O
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The get line ( > function is almost the same as the third form of the get ( > function. The only difference is that it does extract the delimiter character from the input stream but does not store it in the buffer. Its prototype is
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istream& getline(char* buffer, int n, char delim = '\n'); Function
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EXAMPLE 12.18 Reading Characters with the tin . get 1 ine ( )
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main0 char buffer[80]; cin.getline(buffer, 8); tout << " [ " CC buffer C-C "]\n"; cin.getline(buffer, sizeof(buffer)); tout << " [ " C-C buffer CC "]\n"; cin.getline(buffer, sizeof(buffer), '1 I); tout << " [ " CC buffer << "]\n";
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Notethatthesecondcall cin.getline(buffer, sizeof (buffer)) readstotheendoftheinput line, storing GHIJIKLMNOIPQRSTIUWXYIZ in buffer. Unlike the get0 function, the get 1 ine ( ) function then extracts the newline character from the input stream, so that the next character to be read is the A on the next input line.
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The ignore0 function is used to eat characters in the input stream. It simply extracts characters, without copying them into any variable. Its prototype is
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ignore(int n = 1, int delim = EOF); Called in its simplest form, tin. ignore ( > will simply extract one character from tin. More generally, cin.ignore(n) will simply extract n character from tin, and cin.ignore(n, I $ I> would extract all the characters up to the next occurrence of the I $ I istream&
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character (or to the end of the file).
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EXAMPLE 12.19 Eating Characters with the tin . ignore ( )
Function
main0 1 int month, year; tout << "Enter date (mm/dd/yy): '; tin >> month; cin.ignore(); // eats "/" cin.ignore(80, '/I); // eats tin >> year; tout CC "Month = " C-C month C-C ', Year = 19' -CC year C-C endl;
dd/
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This little input routine asks the user for a date in the standard mm/ dd/ yy it the month and the year, ignoring the day dd.
form and then reads from
The peek ( > function is kind of an opposite of the ignore ( ) function: it reads the next character in the input stream without extracting it. Its prototype is int peek ( ) ;
EXAMPLE 12.20 Looking Ahead with the tin . peek ( ) Function
main0 { char buffer[80], C: tout CC cin.peek 0 << I , H << cin.peek 0 << , I; c = cin.peek(); tout << c << ', 'I; cin.get(buffer, 5); // read the next 4 characters into buffer c = cin.peek(); tout << c << ', ' << cin.peek() << ", ' << cin.peek() << endl;
The first three calls to tin . peek ( ) return the IA I in the input stream. Note that it is output directly as the integer 65 (the ASCII code for t A I). Then after reading ABCD into buf f er, the next three calls to tin . peek ( ) return the 1 I in the input stream, output directly as the integer 69. Note that the E calls to the peek ( ) function have no effect upon the input stream.
The putback ( > function reverses the get ( > function by putting a character back into the input stream. Its prototype is
istream& putback(char c); ( ) Function
EXAMPLE 12.21 Using the tin. putback
main0 1 cin.putback('Z'); cin.putback('Y'); cin.putback('X'); char buffer[80]; cin.get(buffer, 9); // read the next 8 characters into buffer tout << ' ['I << buffer << "1, "; cin.putback( 'RI); cin.putback('Q'); cin.putback('P'); // read the next 8 characters into buffer cin.get(buffer, 9); tout << " [ " << buffer << "]\n";
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STREAM I/O
The first three calls to c in. pu tbac k ( ) insert I XY Z I in front of the IA I in the input stream. So the input stream actually contains I XY ZABCDEFGHI JKLMN before the first call to cin.get (). And after the second series of c in. putback ( ) calls, the input stream contains I PQRFGHI JKLMN II.
The is tream class includes several versions of the read ( > function. This is an unformatted input function designed for the direct transfer of raw bytes. It works the same way as the get ( > function except that it does not append the null character to the bytes read. It is typically used with the gcount ( > function which simply returns the number of bytes read:
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