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#include <iostream>
#include <limits>
#include <cmath>
using namespace std;
 
int main() {
	cout << std::numeric_limits<float>::max_digits10 << '\n';
	cout << std::numeric_limits<float>::is_iec559 << '\n';
	cout.precision(20);
	cout << 3.333333333333333 << '\n';
	for(int i = 0; i < 10; ++i) {
		float f = i;
		cout << "f: " << f << " next:" <<  nextafter(f, f+1.0) << " diff: " << f-nextafter(f, f+1.0) << '\n';
	}
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:7:10: error: 'max_digits10' is not a member of 'std::numeric_limits<float>'
  cout << std::numeric_limits<float>::max_digits10 << '\n';
          ^

Standard output is empty