scientific_precision.cpp
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	#include <iomanip>
	#include <iostream>
	#include <cmath>

	int main(){

	// for this output
	std::cout << std::scientific
	<< std::setprecision(15)
	<< M_PI << std::endl;

	//permanent
	std::cout.precision(15);
	std::cout.setf(std::ios::scientific);
	}