File indexing completed on 2023-03-17 10:51:54
0001 #include <limits >
0002 #include <iostream >
0003 #include <vector >
0004 #include <fstream >
0005
0006 using namespace std;
0007
0008 void print(double d)
0009 {
0010 cout.precision(26);
0011 cout.setf(ios_base::scientific,ios_base::floatfield);
0012 cout << d << endl;
0013 }
0014
0015 int main()
0016 {
0017 numeric_limits<double> nl;
0018 cout << "radix = " << nl.radix << endl
0019 << "digits = " << nl.digits << endl
0020 << "digits10= " << nl.digits10 << endl
0021 ;
0022
0023 double d1(1), d10(10), dpi(3.141592);
0024 print(d1);
0025 print(d10);
0026 print(dpi);
0027 size_t sz(100000);
0028 vector<double> v(sz);
0029 vector<double>::iterator it(v.begin()), ed(v.end());
0030 size_t count(0);
0031 ofstream file("vector.txt");
0032 for(;it!=ed;++it) {
0033 *it = count++;
0034 double d(count);
0035 file.write((char *)(&d),sizeof(double));
0036 }
0037
0038
0039
0040 cout << count << " non-zero entries." << endl;
0041 return 0;
0042 }
