The use of streams with files. This programme copy the input file to another file and also print its contents to the IO Stream.
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/******************************************************* * MYCPLUS Sample Code - https://www.mycplus.com * * * * This code is made available as a service to our * * visitors and is provided strictly for the * * purpose of illustration. * * * * Please direct all inquiries to saqib at mycplus.com * *******************************************************/ #include <iostream.h> #include <fstream.h> #include <process.h> void main() { ifstream infile; ofstream outfile; ofstream printer; char filename[20]; cout << "Enter the desired file to copy ----> "; cin >> filename; infile.open(filename, ios::nocreate); if (!infile) { cout << "Input file cannot be opened.\n"; exit(1); } outfile.open("copy"); if (!outfile) { cout << "Output file cannot be opened.\n"; exit(1); } printer.open("PRN"); if (!printer) { cout << "There is a problem with the printer.\n"; exit(1); } cout << "All three files have been opened.\n"; char one_char; printer << "This is the beginning of the printed copy.\n\n"; while (infile.get(one_char)) { outfile.put(one_char); printer.put(one_char); } printer << "\n\nThis is the end of the printed copy.\n"; infile.close(); outfile.close(); printer.close(); } // Result of execution // // (The input file is copied to the file named "COPY") // (The input file is printed on the printer |