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The following example shows peek( ), unget( ), and ignore( ) in action The program first creates a data file called testdat that contains several employee IDs However, there are two types of IDs The first is a four-digit number in the form #dddd, such as #0101 The second ID is a placeholder that uses a word to describe why the ID number is missing The program then looks for, reads, and displays all IDs in the file To accomplish this, it makes use of file look-ahead
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// // // // // // // // // Demonstrate peek(), unget(), and ignore() This program reads a file that contains two types of IDs The first is a four-digit number in this form: #dddd The second is a word that describes why the ID number is missing The program creates a data file called testdat that contains several ID numbers The program then looks for, reads, and displays all IDs in the file
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#include <iostream> #include <fstream> #include <cctype> using namespace std; int main() { char ch; char idnum[5]; // Null-terminate idnum so that it can hold a char * string idnum[4] = 0; // Create an ofstream object and attempt to open the file testdat ofstream fout("testdat"); // Verify that the file has been successfully opened if(!fout) { cout << "Cannot open testdat for output\n"; return 1; } // Write some information to the file fout << "Tom Tommy #5345\nRalph Rolof #denied\nTed Terry #6922\n"; fout << "Harry Holden #pending\n, Skip Jones, #8875\n"; // Close the output file foutclose(); if(!foutgood()) { cout << "Error creating data file"; return 1; }
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// Attempt to open the testdat file ifstream fin("testdat"); if(!fin) { cout << "Cannot open testdat for input\n"; return 1; } // Use exceptions to watch for errors finexceptions(ios::badbit | ios::failbit); try { // Find and display all ID numbers: do { // Find the start of an ID number finignore(40, '#'); // If the end of the file is encountered, stop reading if(fineof()) { finclear(); // clear eofbit break; } // Obtain but don't extract the next character after the # ch = finpeek(); // See if the next character is a digit if(isdigit(ch)) { // If the character is a digit, read the ID number Because // idnum has a null in its fifth character, reading four // characters into the first four elements creates a // null-terminated string finread((char *)idnum, 4); cout << "ID #: " << idnum << endl; } else { // Since the next char is not a digit, read the description cout << "ID not available: "; ch = finget(); while(isalpha(ch)) { cout << ch; ch = finget(); }; // Put back the non-letter char so that it can be found // and processed by other get() statements finunget();
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cout << endl; } } while(fingood()); } catch(ios_base::failure exc) { cout << "Error reading data file\n"; } try { // Close testdat for input finclose(); } catch (ios_base::failure exc) { cout << "Error closing data file"; return 1; } return 0; }
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The output is shown here:
ID ID ID ID ID #: 5345 not available: denied #: 6922 not available: pending #: 8875
This program uses look-ahead to read the IDs in the file First, it uses ignore( ) to find a # character This character marks the start of an ID It then uses peek( ) to determine if what follows is an actual ID number or a verbal description If the character obtained from peek( ) is a digit, a four-digit number is read Otherwise, the description is read The description ends as soon as a non-alphabetic character is read In this case, the last character read is put back into the input stream One other point of interest: Notice that the program uses a combination of exceptions and error-detecting functions to watch for errors This is part of the power of the C++ I/O system: You can use whatever approach works best for the situation at hand
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