Files Total: // Files Example 1. #include <iostream> #include <fstream>

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Darlene Poole
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1 Files // Files Example 1 datafile.open("datafile01.txt"); Total: // Prime the reading of the file. while(datafile) cout << cost << endl; cout << "Total: " << total << endl;

2 // Files Example 2 datafile.open("datafile01.txt"); Total: // Logically makes sense but incorrect. // Goes through the loop one too many times since we did not // pass the EOF marker. while(datafile) cout << cost << endl; cout << "Total: " << total << endl;

3 // Files Example 3 datafile.open("datafile01.txt"); Total: // This requires knowing the amount of data in the file. // Usually, that is not the case. for (int i = 0; i < 4; i++) cout << cost << endl; cout << "Total: " << total << endl;

4 // Files Example 4 ofstream outfile; Total: datafile.open("datafile01.txt"); outfile.open("outputfile01.txt"); for (int i = 0; i < 4; i++) outfile << cost << endl; outfile << "Total: " << total << endl; outfile.close();

5 // Files Example 5 ofstream outfile; char ch; Total: datafile.open("datafile01.txt"); outfile.open("outputfile01.txt"); while ((ch = datafile.peek())!= EOF) outfile << cost << endl; outfile << "Total: " << total << endl; outfile.close();

6 // Files Example 6 ofstream outfile; char ch; string firstname; string lastname; datafile.open("datafile02.txt"); outfile.open("outputfile02.txt"); Don Spickler John Doe Jane Public Dean DeFino Spickler, Don Doe, John Public, Jane DeFino, Dean while ((ch = datafile.peek())!= EOF) datafile >> firstname; datafile >> lastname; outfile << lastname << ", " << firstname << endl; outfile.close();

7 // Files Example 7 ofstream outfile; char ch; string firstname; string lastname; string fullname; Don Spickler John Doe Jane Public Dean DeFino Spickler, Don Doe, John Public, Jane DeFino, Dean datafile.open("datafile02.txt"); outfile.open("outputfile02.txt"); while ((ch = datafile.peek())!= EOF) getline(datafile, fullname); int space = fullname.find(" "); firstname = fullname.substr(0, space); lastname = fullname.substr(space+1); outfile << lastname << ", " << firstname << endl; outfile.close();

8 // Files Example 8 char determinelettergrade(double Average) if (Average < 60) return 'F'; else if (Average < 70) return 'D'; else if (Average < 80) return 'C'; else if (Average < 90) return 'B'; else return 'A'; ofstream outfile; char ch; string firstname; string lastname; string fullname; int gradecount = 0; double currentgrade; double currentgradeamount; double totalgrade; double totalgradeamount; datafile.open("datafile03.txt"); outfile.open("gradereport.txt"); Don Spickler John Doe Jane Public Dean DeFino Spickler, Don Earned Points: 322 Total Points: 375 Average: Letter Grade: B Doe, John Earned Points: 206 Total Points: 248 Average: Letter Grade: B Public, Jane Earned Points: 153 Total Points: 190 Average: Letter Grade: B DeFino, Dean Earned Points: 151 Total Points: 179 Average: Letter Grade: B while ((ch = datafile.peek())!= EOF) getline(datafile, fullname); if (fullname.compare("")!= 0) int space = fullname.find(" "); firstname = fullname.substr(0, space); lastname = fullname.substr(space+1); outfile << lastname << ", " << firstname << endl; gradecount = 0; totalgrade = 0; totalgradeamount = 0;

9 endl; while ((ch = datafile.peek())!= '\n') gradecount++; datafile >> currentgrade; datafile >> currentgradeamount; totalgrade += currentgrade; totalgradeamount += currentgradeamount; getline(datafile, fullname); // remove the \n outfile << "Earned Points: " << totalgrade << endl; outfile << "Total Points: " << totalgradeamount << endl; if (totalgradeamount > 0) double average = totalgrade/totalgradeamount * 100; outfile << "Average: " << average << endl; outfile << "Letter Grade: " << determinelettergrade(average) << outfile << endl; else outfile << "No grade determination at this point." << endl; outfile << endl; outfile.close();

10 // Files Example 9 fstream datafile; char ch; Total: datafile.open("datafile01.txt", ios::in); while ((ch = datafile.peek())!= EOF) datafile.open("datafile01.txt", ios::out ios::app); datafile << endl << "Total: " << total << endl;

Input and Output File (Files and Stream )

Input and Output File (Files and Stream ) BITE 1513 Computer Game Programming Week 14 Scope Describe the fundamentals of input & output files. Use data files for input & output purposes. Files Normally,