+If+a+program+tries+to+open+an+ofstream+to+a+file+that+doesn%E2%80%99t+exist%2C+the+open+operation+creates+a+new%2C+empty+file+for+output..jpg)
+Once+we+are+done+using+an+ifstream+(or+ofstream)%2C+it+can+be+closed+using+the+close()+function+member:.jpg)
+If+inFileName+contains+the+name+of+an+input+file%2C+and+outFileName+contains+the+name+of+an+output+file%2C+then+the+statements..jpg)
+If+a+program+tries+to+open+an+ifstream+to+a+file+that+doesn%E2%80%99t+exist%2C+the+open+is+said+to+fail..jpg)
+Once+an+ifstream+(or+ofstream)+has+been+opened%2C+it+can+be+read+from+using+the+usual+input+(or+output)+operations:.jpg)
+The+ifstream+function+member+eof()+returns+true+if+the+last+attempted+read+found+no+data+remaining+in+the+file..jpg)
+When+the+most+recent+input+operation+found+no+data+remaining+in+the+file%2C+the+input+operation+is+said+to+fail..jpg)
+To+open+an+existing+file+without+emptying+it%2C+the+value+ios_base::app+can+be+given+as+a+second+argument:.jpg)
+Given+input+files%2C+we+can+test+our+program:.jpg)
+The+eof()+function+member+provides+a+convenient+way+to+build+input+loops+that+employ+no+redundant+code:.jpg)
+for+(%3B%3B)+//+input+loop+%7B.jpg)
%7B+ifstream+ins%3B+ofstream+outs%3B.jpg)
+eof()+is+an+member+function+of+ifstream+class..jpg)
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+*+...+*/+ifstream+GetIFStream()+%7B.jpg)
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