51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
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/* DCOPY.CPP -- Example from Chapter 5 of User's Guide */
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/* DCOPY source-file destination-file *
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* copies existing source-file to destination-file *
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* If latter exists, it is overwritten; if it does not *
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* exist, DCOPY will create it if possible *
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*/
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#include <iostream.h>
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#include <process.h> // for exit()
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#include <fstream.h> // for ifstream, ofstream
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main(int argc, char* argv[]) // access command-line arguments
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{
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char ch;
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if (argc != 3) // test number of arguments
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{
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cerr << "USAGE: dcopy file1 file2\n";
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exit(-1);
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}
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ifstream source; // declare input and output streams
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ofstream dest;
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source.open(argv[1],ios::nocreate); // source file must be there
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if (!source)
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{
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cerr << "Cannot open source file " << argv[1] <<
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" for input\n";
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exit(-1);
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}
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dest.open(argv[2]); // dest file will be created if not found
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// or cleared/overwritten if found
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if (!dest)
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{
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cerr << "Cannot open destination file " << argv[2] <<
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" for output\n";
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exit(-1);
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}
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while (dest && source.get(ch)) dest.put(ch);
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cout << "DCOPY completed\n";
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source.close(); // close both streams
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dest.close();
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}
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