28 lines
833 B
C++
28 lines
833 B
C++
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Another example of read() and write() and illustrates the use of gcount( )
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#include <iostream>
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#include <fstream>
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using namespace std;
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int main()
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{
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double doubleNumberArray[4] = {99.75, -34.4, 1776.0, 200.1};
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int i;
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ofstream out("numbers", ios::out | ios::binary);
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if(!out) {
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cout << "Cannot open file.";
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return 1;
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}
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out.write((char *) &doubleNumberArray, sizeof doubleNumberArray);
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out.close();
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for(i=0; i<4; i++) // clear array
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doubleNumberArray[i] = 0.0;
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ifstream in("numbers", ios::in | ios::binary);
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in.read((char *) &doubleNumberArray, sizeof doubleNumberArray);
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cout << in.gcount() << " bytes read\n"; // see how many bytes have been read
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for(i=0; i<4; i++) // show values read from file
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cout << doubleNumberArray[i] << " ";
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in.close();
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return 0;
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}
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