Testing error states. : cin « Development « C++ Tutorial

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C++ Tutorial » Development » cin

5.1.9.Testing error states.

#include <iostream>

using std::cin;

using std::cout;

using std::endl;



int main()

{

   int integerValue;



   // display results of cin functions

   cout << "Before a bad input operation:"

      << "\ncin.rdstate(): " << cin.rdstate()

      << "\n    cin.eof(): " << cin.eof()

      << "\n   cin.fail(): " << cin.fail()

      << "\n    cin.bad(): " << cin.bad()

      << "\n   cin.good(): " << cin.good();



   cin >> integerValue;

   cout << endl;



   cout << "After a bad input operation:"

      << "\ncin.rdstate(): " << cin.rdstate()

      << "\n    cin.eof(): " << cin.eof()

      << "\n   cin.fail(): " << cin.fail()

      << "\n    cin.bad(): " << cin.bad()

      << "\n   cin.good(): " << cin.good() << endl << endl;



   cin.clear();



   cout << "After cin.clear()" << "\ncin.fail(): " << cin.fail()

      << "\ncin.good(): " << cin.good() << endl;

   return 0;

}

Before a bad input operation:
cin.rdstate(): 0
    cin.eof(): 0
   cin.fail(): 0
    cin.bad(): 0
   cin.good(): 12

After a bad input operation:
cin.rdstate(): 0
    cin.eof(): 0
   cin.fail(): 0
    cin.bad(): 0
   cin.good(): 1

After cin.clear()
cin.fail(): 0
cin.good(): 1

5.1.cin
	5.1.1.	Read int value from keyboard
	5.1.2.	cin Handles Different Data Types
	5.1.3.	Use get() to read a string that contains spaces
	5.1.4.	Use the extraction operator >> with cin.get( ) to process an entire string.
	5.1.5.	cin with strings (cin.getline)
	5.1.6.	cin and atoi, atof functions
	5.1.7.	Using peek() and putback()
	5.1.8.	Concatenate put()
	5.1.9.	Testing error states.
	5.1.10.	Unformatted I/O using cin.read, cin.gcount and cout.write
	5.1.11.	Contrasting input of a string via cin and cin.get
	5.1.12.	Demonstrating member function width
	5.1.13.	Read char array from keyboard, get its length and concatenate two strings
	5.1.14.	Read a character from keyboard
	5.1.15.	Copy all standard input to standard output
	5.1.16.	Manipulator that skips until end-of-line
	5.1.17.	avoids buffer overflow with cin.width
	5.1.18.	Extends std::streambuf to create data buffer
	5.1.19.	Using member functions get, put and eof.
	5.1.20.	Contrasting input of a string with cin and cin.get.
	5.1.21.	Unformatted I/O with read, gcount and write.
	5.1.22.	Character input with member function getline.
	5.1.23.	Is it a bad input

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