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with the prefix ''cin." when used because they are member functions of the object cin. The call cin. getline (str, n) reads up to n characters into str and ignores the rest. Example 7.2 the cin.getline() Function with Two Parameters This fragment echoes the input, line by line: char line[80]; do { cin.getline(line, 80); if (*line) cout << "[" << line << "]\n"; } while (*line); The time has come, the walrus said, [The time has come, the walrus said,] to think of other things, [to think of other things,] ^Z
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(*line) becomes "true" when line contains a non-NUL string, because only then will line[0] be different from the NUL character. The call getline(str, n, ch) reads input to the first occurrence of the delimiting character ch into str. If ch is the newline character '\n', then this is equivalent to getline(str, n). This is illustrated in the next example where the delimiting character is the comma. Example 7.3 the cin.getline() Function This program echoes the input, clause by clause: char clause[30]; do { cin.getline(clause, 30, ','); if (*clause) cout << " [" << clause << "]\n"; } while (*clause); The time has come, the walrus said, to think of other things, ^Z [The time has come] [the walrus said] [ to think of other things.] [
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The invisible end-line character that follows ''said," is stored as the first character of the next input line. Since the comma is being used as
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the delimiting character, the endline character is processed just like an ordinary character. get() is used for reading input character-by-character. The call get(ch) copies the next character from the input stream cin into the variable ch and returns 1, unless the end of file is detected in which case it returns 0. The opposite of get is put. put() is used for writing to the output stream cout character-by-character The putback() function restores the last character read by a get() back to the input stream cin. The ignore () function reads past one or more characters in the input stream cin without processing them. Example 7.4 illustrates these functions. Example 7.4 The cin.putback() and cin.ignore() Functions This tests a function that extracts the integers from the input stream: int nextInt ( ); void main ( ) { int m=nextInt ( ), n=nextInt ( ); cin.ignore(80,'\n'); //ignore rest of input line cout <<m <<" + " <<n <<" = " <<m+n <<endl; } int nextInt( ) { char ch; int n; while (cin.get (ch)) if (ch>='0' && ch<='9') { //next char is a digit cin.putback(ch); // replace so it can be cin >>n; // read as a complete int break; } return n; } What is 305 plus 9416 305 + 9416 = 9721
next_Int() scans past the characters 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 cin so that the >> can read it into n.
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peek() can be used in place of the combination get() and putback(). The call ch=cin. peek() copies the next character of the input stream cin into the char variable ch without removing that character from the input stream. The following code shows how peek() can be used in place of the get() and putback() functions. while (ch = cin.peek ()) if (ch >= '0' && ch <= '9') { cin >> n; break; } else cin.get(ch); The expression ch=cin.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 cin and the loop continues. If the end-of-file is encountered, the expression ch = cin.peek() returns 0, stopping the loop. Character Functions Defined in <ctype.h> Many character manipulation functions are defined in <ctype.h>; see Table 7.1. Table 7.1 <ctype.h> Functions isalnum() int isalnum(int c); Returns nonzero if c is an alphabetic or numeric character; otherwise returns 0. isalpha() int i salpha (int c); Returns nonzero if c is an alphabetic character; otherwise returns 0. iscntrl() int iscntrl (int c); Returns nonzero if c is a control character; otherwise returns 0. isdigit() int isdigit (int c); Returns nonzero if c is a digit character; otherwise returns 0. isgraph() int isgraph (int c); Returns nonzero if c is any nonblank printing character; otherwise returns 0. islower() int islower (int c); Returns nonzero if c is a lowercase alphabetic character; otherwise returns 0. isprint() int isprint (int c); Returns nonzero if c is any printing character; otherwise returns 0. ispunct() int ispunct (int c); Returns nonzero if c is any printing character, except the alphabetic characters, the numeric characters, and the blank; otherwise returns 0. (table continued on following page)
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