Formatted I/O in C++

#include<bits/stdc++.h>
using namespace std;

// The width() function defines width 
// of the next value to be displayed 
// in the output at the console.
void IOS_width()
{
    cout << "--------------------------\n";
    cout << "Implementing ios::width\n\n";
    
    char c = 'A';
     
    // Adjusting width will be 5.
    cout.width(5);
     
    cout << c <<"\n";
     
     
    int temp = 10;
     
    // Width of the next value to be
    // displayed in the output will 
    // not be adjusted to 5 columns.
    cout<<temp;
    cout << "\n--------------------------\n";
}

void IOS_precision()
{
    cout << "\n--------------------------\n";
    cout << "Implementing ios::precision\n\n";
    cout << "Implementing ios::width";
    cout.setf(ios::fixed, ios::floatfield);
    cout.precision(2);
    cout<<3.1422;
    cout << "\n--------------------------\n";
}

// The fill() function fills the unused 
// white spaces in a value (to be printed
// at the console), with a character of choice.
void IOS_fill()
{
    cout << "\n--------------------------\n";
    cout << "Implementing ios::fill\n\n";
    char ch = 'a';
    
    // Calling the fill function to fill 
    // the white spaces in a value with a
    // character our of choice.
    cout.fill('*');
    
    cout.width(10);
    cout<<ch <<"\n";
    
    
    int i = 1;
    
    // Once you call the fill() function, 
    // you don't have to call it again to 
    // fill the white space in a value with
    // the same character.
    cout.width(5);
    cout<<i;
    cout << "\n--------------------------\n";
}

void IOS_setf()
{
    cout << "\n--------------------------\n";
    cout << "Implementing ios::setf\n\n";
    int val1=100,val2=200;
    cout.setf(ios::showpos);
    cout<<val1<<" "<<val2;
    cout << "\n--------------------------\n";
}

void IOS_unsetf()
{
    cout << "\n--------------------------\n";
    cout << "Implementing ios::unsetf\n\n";
    cout.setf(ios::showpos|ios::showpoint);
    // Clear the showflag flag without 
    // affecting the showpoint flag
    cout.unsetf(ios::showpos); 
    cout<<200.0; 
    cout << "\n--------------------------\n";
}

// Driver Method
int main()
{
    IOS_width();
    IOS_precision;
    IOS_fill();
    IOS_setf();
    IOS_unsetf();
    return 0;
} 

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

void Example()
{
    // performs ssame as setf( )
    cout << setiosflags(ios::showpos);
    cout << 123<<"\n";
    
    // hexadecimal base (i.e., radix 16)
    cout << hex << 100 << endl; 
    
    // Set the field width
    cout << setfill('*') << setw(10) << 2343.0; 
}

int main()
{
    Example();
    return 0;
}