1. Standard Input/Output Stream
// Header file
#include <iostream>
int size;
float avg;
cin >> size;
// cin: Standard input stream
// Processing
cout << "Average is " << avg;
// cout: standard output stream
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2. Header File for File I/O
// File Stream
#include <fstream>
// Input File Stream
struct ifstream // should be class { … }
// Output File Stream
struct ofstream // should be class
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3. File Input/Output #include <fstream> int main() {
ifstream MyInput;
ofstream yourOutFile;
int x;
MyInput.open(“P6.IN");
yourOutFile.open(“p6.out”);
if (MyInput.fail() || !P6Out.good())
cout << "Error: Cannot open files!";
return 1; }
MyInput >> x;
while (!MyInput.eof())
x ++;
yourOutFile << x;
MyInput.close();
yourOutFile.close();
return 0;

4. File Input/Output // DO_01: Include header file for file I/O
int main() {
// DO_02: declare variables for file I/O
// DO_03: open file
// DO_04: Check open operation
// DO_05: Read value from the open file
// DO_06: Fill condition: read until the end of file
while ( )
// DO_07: Output value to a file
// Read the next value from the file }
// DO_08: Close files
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5. Declare and Initialize Stream Variables
#include <fstream>
int main() {
ifstream MyInput(“P6.in");
ofstream P6Out(“P6.out");
if (MyInput.fail() || !P6Out.good())
cout << "Error: Cannot open files!";
return 1; }
// Do work
MyInput.close();
P6Out.close();
return 0;
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6. Input File Name #include <fstream> int main() {
char file_name[21];
// Cannot use data type string for file_name
ifstream MyInput;
cout << “Enter input file name: ”;
cin >> file_name;
MyInput.open(file_name);
// MyInput.open(“P6.IN");
// Check open operation
if (!MyInput.good())
cout << "Error: Cannot open input file!";
return 1; }
// Do work
MyInput.close();
return 0;

7. Selecting I/O Streams #include <fstream> int main() {
ifstream MyInput;
ofstream yourOutFile;
// Open files for I/O
// Check open operations
cin = MyInput;
cout = yourOutFile;
cin >> x;
cout << ++x;
cout << x++;
// Close files
return 0; }

8. File Stream as Function Parameter
int main() {
ifstream MyInput;
if (!OpenFile(MyInput))
return 1;
return 0; }
bool OpenFile(ifstream& inFile)
char file_name[21];
cin >> file_name;
inFile.open(file_name);
if (!inFile.good())
cout << "Error: Cannot open input file";
return false;
else
return true;
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9. This Week Today Lab10 / Quiz10-1 / Prog6 Thursday
Lab11 / Prog6 / Test 3
Friday
No Class