📄 12.13.cpp
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#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>
void main()
{
fstream out;
out.open("f1.txt",ios::out);
if(!out)
{
cerr<<"f1.txt can't open.\n";
abort();
}
out<<"this is a string.\n";
out<<"this is a program.\n";
out<<"ok!\n";
out.close();
}
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