Stream3, C++ (gcc)

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//g++  7.4.0

//////////////////////////////////////////////////////////////////////////
//Stream3
//this code is created by Rezaul Hoque on July 20,2022;contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////

#include <fstream>
#include <iostream>
#include <iomanip>
#include <string>
#include <strstream>
//stream manipulator
std::ostream& l(std::ostream& os)
{
  return (os<<"\n");
}

void fill(char c)
{
std::cout.width(25);
std::cout.fill(c);
std::cout<<l;
}

int main()
{

fill('#');
std::cout.put('J').put('u').put('l').put(' y').put(' ').put('2').put('0').put(',').put('2').put('0').put('2').put('2').put('\n');
const double hr=12.30;
std::cout.setf(std::ios::showpoint);
std::cout<<"\nTime: "<<hr<<" hours"<<l;

std::ostrstream o;
o<<":::More stream examples:::"<<l<<std::ends;
o.freeze(0);
std::cout<<o.str();
char a[30]="Another stream ";
std::ostrstream o2(a,sizeof a,std::ios_base::app);
o2<<" example :"<<std::ends;
std::cout<<o2.str()<<l;
o2.freeze(false);
bool t,n;

std::istrstream  s("true false");

s>>std::boolalpha>>t>>n;
std::cout<<"std::boolalpha example "<<l<<"Yes: "<<t<<" "<<" No: "<<n<<l;
char x,y,z;
std::istrstream("* % !")>>x>>y>>z;
std::cout<<"std::skipws(default) :"<<l<<"x = "<<x<<l<<"y= "<<y<<l<<"z= "<<z<<l;
std::cout<<"Is the above string sequence is an example of std::skipws?"<<l<<"Yes: "<<t<<l;
fill('~');
std::istrstream("* % !")>>std::noskipws>>x>>y>>z;
std::cout<<"std::noskipws:"<<l<<"x = "<<x<<l<<"y= "<<y<<l<<"z= "<<z<<l;

std::cout<<"Is the above string sequence is an example of std::skipws?"<<l<<"No: "<<n<<l;
fill('#');
return 0;
}

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Compilation time: 0.82 sec, absolute running time: 0.16 sec, cpu time: 0 sec, memory peak: 5 Mb, absolute service time: 1,12 sec