#include #include using namespace std; int main () { ofstream OutFile1("test.txt"); OutFile1 << "Line 1 obj1- This is awesome! \n"; OutFile1 << "Line 2 obj1- And Amazing!! " << endl; OutFile1.close(); string line1; ifstream InFile1("test.txt"); cout << endl << "*** Reading file after inserting 2 lines *** \n"; while ( getline (InFile1, line1) ) { cout << line1 << '\n'; } InFile1.close(); /**************************/ ofstream OutFile2; OutFile2.open("test.txt", ios::app); OutFile2 << "Line 3 obj2- Used ios::app \n"; OutFile2 << "Line 4 obj2- Used ios::app \n"; OutFile2.close(); string line2; ifstream InFile2("test.txt"); cout << endl << endl << "*** Reading file after using ios::app for line 3 & 4 *** \n"; while ( getline (InFile2, line2) ) { cout << line2 << '\n'; } InFile2.close(); /**************************/ ofstream OutFile3; OutFile3.open("test.txt", ios::ate); OutFile3 << "Line 5 obj3- Used ios::ate" << endl; OutFile3 << "Line 6 obj3- Used ios::ate" << endl; string line3; ifstream InFile3("test.txt"); cout << endl << endl << "*** Reading file after using ios::ate for line 5 & 6 *** \n"; while ( getline (InFile3, line3) ) { cout << line3 << '\n'; } InFile3.close(); /**************************/ ofstream OutFile4; OutFile4.open("test.txt", ios::trunc); OutFile4 << "Line 7 obj4- Used ios::trunc \n"; OutFile4 << "Line 8 obj4- Used ios::trunc \n"; OutFile4.close(); string line4; ifstream InFile4("test.txt"); cout << endl << endl << "*** Reading file after using ios::trunc for line 7 & 8 *** \n"; while ( getline (InFile4, line4) ) { cout << line4 << '\n'; } InFile4.close(); /**************************/ ofstream OutFile5; OutFile5.open("test.txt"); OutFile5 << "Line 9 obj5- File opened without any mode parameter \n"; OutFile5 << "Line 10 obj5- File opened without any mode parameter \n"; OutFile5.close(); string line5; ifstream InFile5("test.txt"); cout << endl << endl << "*** Reading file after inserting line 9 & 10 without any mode parameter *** \n"; while ( getline (InFile5, line5) ) { cout << line5 << '\n'; } InFile5.close(); /**************************/ ofstream OutFile6; OutFile6.open("test.txt", ios::ate|ios::in|ios::out); OutFile6 << "Line 11 obj6- Used ios::in|out|ate" << endl; OutFile6 << "Line 12 obj6- Used ios::in|out|ate" << endl; string line6; ifstream InFile6("test.txt"); cout << endl << endl << "*** Reading file after using ios::ate along with ios::in and ios::out for line 11 & 12 *** (Note: It seems this worked like ios::app) \n"; while ( getline (InFile6, line6) ) { cout << line6 << '\n'; } InFile6.close(); /**************************/ }

Working-With-Files-Basics