double f =3.14159; std::cout << std::setprecision(5) << f << '/n'; std::cout << std::setprecision(9) << f << '/n'; std::cout << std::fixed; std::cout << std::setprecision(5) << f << '/n'; std::cout << std::setprecision(9) << f << '/n'; return 0; }...
std::setprecision /*unspecified*/setprecision(intn); 用于表达式out<<setprecision(n)或in>>setprecision(n)时,设置流out或in的precision参数准确为n。 参数 n-精度的新值 返回值 返回未指定类型的对象,使得若str是std::basic_ostream<CharT, Traits>类型的输出流名称或std::basic_istream<CharT, Traits>类型...
#include <iomanip> // std::setprecision int main () { double f =3.14159; std::cout << std::setprecision(5) << f << '\n'; std::cout << std::setprecision(9) << f << '\n'; std::cout << std::fixed; std::cout << std::setprecision(5) << f << '\n'; std::cout <...
L); std::cout << "default precision (6): " << pi << '\n' << "std::setprecision(10): " << std::setprecision(10) << pi << '\n' << "max precision: " << std::setprecision(std::numeric_limits<long double>::digits10 + 1) << pi << '\n'; } 输出: default precision...
#include <iomanip> // std::setprecision int main () { double f =3.14159; std::cout << std::setprecision(5) << f << '\n'; std::cout << std::setprecision(9) << f << '\n'; std::cout << std::fixed; std::cout << std::setprecision(5) << f << '\n'; ...
#include <iostream> #include <iomanip> #include <cmath> #include <limits> int main() { const long double pi = std::acos(-1.L); std::cout << "default precision (6): " << pi << '\n' << "std::setprecision(10): " << std::setprecision(10) << pi << '\n' << "max pr...
std::setprecision std::fixed, std::scientific, std::hexfloat, std::defaultfloat std::setbase std::showbase, std::noshowbase std::quoted std::boolalpha, std::noboolalpha std::dec, std::hex, std::oct std::setfill std::setw std::left, std::right, std::internal std::showpos, std...
将setprecision与std::basic_ostream上的<<或std::basic_istream上的>>一起使用具有完全相同的效果,只...
std::setprecision by: tarmat | last post by: I'm trying to create a function that will turn a float into a std::string that always shows the number to two decimal places. I have the following but it doesn't give the desired output: ... C / C++ 8 question: std:string an...
std::fixed make std::setprecision() refer to how many digits are printed after the decimal point. Before you change the default formatting to std::fixed, std::defaultfloat is set, and std::setprecision() sets the total number of digits to be printed, including the ones b...