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CHAP. 71
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EXAMPLE 7.5 The tin. getline ( ) Function
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This program echoes the input, clause by clause: main0
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char clause[20]; cin.getline(clause, 20, I,'); if (*clause) tout << "\t[" << clause << "]\n"; while (*clause);
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Notice that the invisible endline character that follows weary, is stored as the first character of the next input line. Since the comma is being used as the delimiting character, the endline character is processed just like an ordinary character.
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T h e cin.get()
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function is used for reading input character-by-character. The call
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tin. get (ch) copies the next character from the input stream tin into the variable ch and
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returns 1, unless the end of file is detected in which case it returns 0. EXAMPLE 7.6 The tin . get ( ) Function
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This program counts the number of occurrences of the letter e in the input stream. The loop continuesaslongasthe cin.get(ch) function is successful at reading characters into ch:
main0 char ch; int count = 0; while (cin.get(ch)) if (ch == 'e') ++count; tout << count << H e's were
counted.\n";
The opposite of get is put. The cou t . put ( > function is used for writing to the output stream tout character-by-character. This is illustrated in the next example.
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[CHAP. 7
EXAMPLE 7.7 The tout . put ( ) Function
This program echoes the input stream, capitalizing each word: #include main0 cctype.h>
char ch, pre = '\O'; while (cin.get(ch)) { if (pre == ' ' II pre == '\n') cout.put(char(toupper(ch))); else cout.put(ch); pre = ch;
The output looks like this:
The variable pre holds the previously read character. The idea is that if pre is a blank or the newline character, then the next character ch would be the first character of the next word. In that case, ch is replaced by its equivalent uppercase character ch + IA I - I I a . The header file CC type . h> declares the function toupper equivalent of ch if ch is a lowercase letter. which returns the uppercase
The tin . putback ( > function restores the last character read by a tin. get ( > back to the input stream tin. The tin. ignore ( > function reads past one or more characters in the input stream tin without processing them. Example 7.8 illustrates these functions.
The tin . peek ( > function can be used in place of the combination tin . get ( ) cin.putback (> functions I* The call
ch = cin.peek(
copies the next character of the input stream tin into the char variable ch without removing that character from the input stream. Example 7.9 shows how the peek ( > function can be used in place of the .get ( > and putback ( > functions.
CHAP. 71
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EXAMPLE 7.8 The tin. putback
( ) and tin. ignore ( ) Functions
This tests a function that extracts the integers from the input stream:
int nextIntO; main0 { int m = nextIntO, n = nextIntO; ignore rest of input line cin.ignore(80,'\n'); // tout CC m CC u + N CC n CC " = " CC m+n CC endl; 1 int nextIntO { char ch; int n; while (cin.get(ch)) if (ch >= '0' SC& ch <= cin.putback(ch); tin >> n; break; ) return n; \
'9') { // next character is a digit // put it back so it can be // read as a complete int
The next In t ( ) function scans past the characters in c in until it encounters the first digit. In this run, that digit is 3. Since this digit will be part of the first integer 305, it is put back into c in so that the complete integer 305 can be read into n and returned. EXAMPLE 7.9 The tin . peek ( ) Function This version of the next Int ( > function is equivalent to the one in the previous example:
int nextIntO { char ch; int n; I while (ch = cin.peek()) if (ch >= '0' && ch <= '9') { tin >> n; break; > else cin.get(ch); return n; >
The expression ch = tin . peek ( ) copies the next character into ch, and returns 1 if successful. Then if ch is a digit, the complete integer is read into n and returned. Otherwise, the character is removed from c in and the loop continues. If the end-of-file is encountered, the expression ch = c in . peek ( ) returns 0, stopping the loop.
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