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c++3-07-08 - inp>>a>>b>>c int d...

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March 7, 2008 C++ File I/O *Input/Output from/to disk files *Why? --large input --data from another program -binary i/o -Repetitive input -Archival Storage of Output C++ interface to files employs variables of file Type: Istream-- cin #include<iostream> Ostream- cout, cerr #include <fstream> Ifstream using namespace std; ofstream Use file streams: similar to cin/cout: << output >> input difference: can have an arbitrary number of ifstream and ofstream variables file streams must be explicitly opened. Opening files: #include <fstream> using namespace std; Int main() { ifstream inp; inp.open (“input.txt”); int a, b, c;
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Unformatted text preview: inp>>a>>b>>c; int d; inp>>d; //gets 10 or ifstream inp(“input.txt:”); int main() { ifstream inp; inp.open(“input.txt”); “../data/input.txt” if (inp.fail()) cerr<<”Could not open file.\n”; else { int a,b,c; inp>>a>>b>>c; //copy file #include <fstream> using namespace std; int main() { ifstream inp*”source.txt”); ofstream out; out.open(“copy.txt”); create if it doesn’t exist or overwrite it if it does int a, b, c; inp>>a>>b>>c; out<<a<<’ ‘<<b << ‘ ‘ <<c<< ‘\n’; formatting ofstream out; out.open(“Log.txt”, ios::app);...
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