45 lines
1.9 KiB
C++
45 lines
1.9 KiB
C++
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// fig19_07.cpp
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// Controlling precision of floating-point values.
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#include <iomanip>
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#include <iostream>
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#include <cmath>
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int main() {
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double root2{std::sqrt(2.0)}; // calculate square root of 2
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std::cout << "Square root of 2 with precisions 0-9.\n"
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<< "Precision set by ostream member function precision:\n";
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std::cout << std::fixed; // use fixed-point notation
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// display square root using ostream function precision
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for (int places{0}; places <= 9; ++places) {
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std::cout.precision(places);
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std::cout << root2 << "\n";
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}
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std::cout << "\nPrecision set by stream manipulator setprecision:\n";
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// set precision for each digit, then display square root
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for (int places{0}; places <= 9; ++places) {
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std::cout << std::setprecision(places) << root2 << "\n";
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}
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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