Stream4, C++ (gcc)

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//g++  7.4.0

//////////////////////////////////////////////////////////////////////////
//Stream4
//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('#');
char a[50]="hi there,how are you";
std::istrstream r(a);
char s1[25],s2[25];
r>>s1;
r.seekg(r.tellg());
r>>s2;
std::cout<<"s1 :"<<s1<<l<<"s2: "<<s2<<l;
std::ostringstream o(a);
o.seekp(0,std::ios_base::end);
o<<"?\nFine,Thanks!";
std::cout<<o.tellp()<<l;
o<<"\nJuly 20,2022.";
o.seekp(0);
o<<'H';
std::cout<<o.str()<<l;

fill('#');
return 0;
}

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Compilation time: 0.95 sec, absolute running time: 0.22 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 1,23 sec