Question

How to use scientific format flag 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 << "default:\n";
	cout << a << endl << b << endl << c << endl;

	cout << endl;

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

	return 0;
}


/*
run:

default:
3.142
2018
1e-06

scientific:
3.1416e+00
2.0180e+03
1.0000e-06

*/

 

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