What is the role of **std::setprecision()** without **std::fixed** in c++?

Question

As shown in the tutorial http://www.cplusplus.com/reference/iomanip/setprecision/

// setprecision example
#include      // std::cout, std::fixed
         


        

Answer 1

This is because "When floatfield is set to fixed, floating-point values are written using fixed-point notation: the value is represented with exactly as many digits in the decimal part as specified by the precision field (precision) and with no exponent part." ref. http://www.cplusplus.com/reference/ios/fixed/