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#include <iostream>
 
int main(void) {
	std::streamsize ss = std::cout.precision();
 
	double a = 1.267432;
 
	std::cout << "a = " << a << '\n';
 
	std::cout.precision(3);
	std::cout << "a becomes = " << a << '\n';
 
	// std::cout.precision(ss);
	// std::cout << "Original a= " << a << '\n';
 
	std::cout << "The number a in fixed:      " << std::fixed(6) << ss << '\n'
			  << "The number a in default:    " << std::defaultfloat << a << '\n';
 
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:16:61: error: invalid initialization of non-const reference of type 'std::ios_base&' from an rvalue of type 'int'
  std::cout << "The number a in fixed:      " << std::fixed(6) << ss << '\n'
                                                             ^
In file included from /usr/include/c++/5/ios:42:0,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/ios_base.h:1035:3: note: in passing argument 1 of 'std::ios_base& std::fixed(std::ios_base&)'
   fixed(ios_base& __base)
   ^

Standard output is empty