Question

How to format double value in C++

Answer 1

#include <iostream>

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

int main()
{
	double d = 3.14;

	cout.precision(3);             
	cout << "default:    " << d << endl;
	cout << "showpoint:  " << std::showpoint << d << endl;
	cout << "fixed:      " << std::fixed << d << endl;
	cout << "scientific: " << std::scientific << d << endl;

	return 0;
}


/*
run:

default:    3.14
showpoint:  3.14
fixed:      3.140
scientific: 3.140e+00

*/

 

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