Printing tips C++

numbers.cpp

std::cout << std::setw(2) << setfill('0') << myNumber;

table_format.cpp

#include <iostream>
#include <iomanip>
#include <sstream>


double myNumber1 = 234234152.0055345;
double myNumber2 = 222121252.0055345;

stringstream ss;
ss.setf(ios::fixed);
ss.precision(2);
 
ss << setw(12) << right << "myNumber1" << "\t" << "myNumber2" << endl;
ss << setw(12) << right <<  myNumber1 << "\t" <<  myNumber2 << endl;
 
cout << ss.str();

two_decimal.cpp

#include <iostream>

int main()
{
    double d = 1.23;

    std::cout.setf(std::ios::fixed);
    std::cout.precision(2);
    std::cout << d;
}