#include<iostream>#include<cmath>#include<iomanip>using namespace std;int main(){    cout<<"default bool values: "<<true<<" "<<false<<"\nalpha bool value: "<<boolalpha<<true<<" "<<false<<endl;    cout<<noboolalpha<<endl;    cout<<"default: "<<20<<" "<<1924<<endl;    cout<<"octal: "<<oct<<20<<" "<<1024<<endl;    cout<<"hex: "<<hex<<20<<" "<<1024<<endl;    cout<<"decimal: "<<dec<<20<<" "<<1024<<endl;    cout<<endl;    cout<<showbase;    cout<<uppercase<<"default: "<<20<<" "<<1924<<endl;    cout<<uppercase<<"octal: "<<oct<<20<<" "<<1024<<endl;    cout<<uppercase<<"hex: "<<hex<<20<<" "<<1024<<endl;    cout<<uppercase<<"decimal: "<<dec<<20<<" "<<1024<<endl;    cout<<nouppercase<<noshowbase;    cout<<showbase<<"hex: "<<hex<<20<<" "<<1024<<noshowbase<<endl;    cout<<dec;    cout<<endl;    cout<<"precision: "<<cout.precision()<<",Value: "<<sqrt(2.0)<<endl;    cout.precision(12);    cout<<"precision: "<<cout.precision()<<",Value: "<<sqrt(2.0)<<endl;    cout<<setprecision(3);    cout<<"precision: "<<cout.precision()<<",Value: "<<sqrt(2.0)<<endl;    cout<<"default format: "<<100*sqrt(2.0)<<‘\n‘        <<"scientific: "<<scientific<<100*sqrt(2.0)<<‘\n‘        <<"fixed decimal: "<<fixed<<100*sqrt(2.0)<<‘\n‘;       // <<"hexadecimal: "<<std::hexfloat<<100*sqrt(2.0)<<‘\n‘        //<<"use defaults: "<<defaultfloat<<100*sqrt(2.0)<<"\n\n"    cout<<endl;    int i=-16;    double d=3.14159;    cout<<"i: "<<setw(12)<<i<<"next col"<<‘\n‘        <<"d: "<<setw(12)<<d<<"next col"<<‘\n‘;    cout<<left        <<"i: "<<setw(12)<<i<<"next col"<<‘\n‘        <<"d: "<<setw(12)<<d<<"next col"<<‘\n‘        <<right;    cout<<right        <<"i: "<<setw(12)<<i<<"next col"<<‘\n‘        <<"d: "<<setw(12)<<d<<"next col"<<‘\n‘;    cout<<internal        <<"i: "<<setw(12)<<i<<"next col"<<‘\n‘        <<"d: "<<setw(12)<<d<<"next col"<<‘\n‘;    cout<<setfill(‘#‘)        <<"i: "<<setw(12)<<i<<"next col"<<‘\n‘        <<"d: "<<setw(12)<<d<<"next col"<<‘\n‘        <<setfill(‘ ‘);    char ch;    cin>>noskipws;    while(cin>>ch)        cout<<ch;    cin>>skipws;}