how to print a decimal number upto 6 places of decimal in c++

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;

    std::cout << std::fixed;
    std::cout << std::setprecision(2);
    std::cout << d;
}

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	float x=10.3445f;
	
	cout<<fixed<<setprecision(5)<<x<<endl;
	cout<<fixed<<setprecision(2)<<x<<endl;
	cout<<fixed<<setprecision(3)<<x<<endl;
	cout<<fixed<<setprecision(0)<<x<<endl;
	
	return 0;
}

#include <iostream>
#include <cstdio>
using namespace std;

int main() 
{
    // This code helps you to print a number with desired decimal
    double Number=10.3454;
    printf("%.3lf",Number);

    return 0;
}

std::cout << std::setprecision(2) << std::fixed;
// where the 2 is how many decimal places you want
// note you need to <iomanip>