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std::ios_base::precision(3) C++ Standard Libary std::ios_base::precision(3) NAME std::ios_base::precision - std::ios_base::precision Synopsis streamsize precision() const; (1) streamsize precision( streamsize new_precision ); (2) Manages the precision (i.e. how many digits are generated) of float- ing point output performed by std::num_put::do_put. 1) Returns the current precision. 2) Sets the precision to the given one. Returns the previous preci- sion. The default precision, as established by std::basic_ios::init, is 6. Parameters new_precision - new precision setting Return value the precision before the call to the function Example // Run this code #include <iostream> int main() { const double d = 1.2345678901234; std::cout << "The default precision is " << std::cout.precision() << "\n\n"; std::cout << "With default precision d is " << d << '\n'; std::cout.precision(12); std::cout << "With high precision d is " << d << '\n'; } Output: The default precision is 6 With default precision d is 1.23457 With high precision d is 1.23456789012 See also width manages field width (public member function) setprecision changes floating-point precision (function) http://cppreference.com 2022.07.31 std::ios_base::precision(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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