Question

How to use hexfloat and defaultfloat format flags in C++

Answer 1

#include <iostream>
#include <iomanip> 

using std::cout;
using std::endl;

int main()
{
	double a = 3.14159;
	double b = 2018.0;
	double c = 1.0e-6;

	cout.precision(4);

	cout << "hexfloat:\n" << std::hexfloat;
	cout << a << endl << b << endl << c << endl;

	cout << endl;

	cout << "defaultfloat:\n" << std::defaultfloat;
	cout << a << endl << b << endl << c << endl;

	return 0;
}


/*
run:

hexfloat:
0x1.9220p+1
0x1.f880p+10
0x1.0c6fp-20

defaultfloat:
3.142
2018
1e-06

*/

 

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