std::scientific is a stream manipulator for real numbers to be displayed in the scientific notation.


#include <iostream>



int main()

{

  const double x = 123.456;

  std::cout            << x << '\n'

    << std::fixed      << x << '\n'

    << std::scientific << x << '\n';

}

Screen output:


123.456

123.456000

1.234560e+02

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(C++) std::scientific