session 10.IO Streams.md

1).IOST1

#include<iostream>
#include<string>
#include<sstream>
using namespace std;

int main() {
string a;
getline(cin,a,':');
float f;
cin >> f;
stringstream my_stream(ios::in|ios::out);
my_stream << a;
my_stream.seekg(-7,ios::end);
std::string dat(a);
cout << "I have a double : " << f*f;
return 0;
}

2).IOST2

#include <iostream>

#include <iomanip>
using namespace std;
int main() {
   int n;
  cin>>n;
  cout<<"0123456789"<<endl;
  cout<<setw(10)<<n<<endl;
  cout<<setw(10)<<setfill('0')<<n<<endl;
cout<<setw(10)<<setfill('.')<<n<<endl;
return 0;
}

3).IOST3

#include <iostream>
using namespace std; 
int main () { 
long int a,b;
cin>>a;
cin>>std::hex>>b;
cout<<"You have entered integer: "<<a<<"\n";
cout<<"Equivalent value of given hexadecimal number is: "<<b<<endl;
return 0; 
}

4).IOST4

  #include <iostream>
  #include <bits/stdc++.h>
  using namespace std;
  int main() {
  char x[500];
  cin.get(x,30);
  for(int i=0;x[i]!='\0';i++)
  {
    if (cin.peek()=='#')
    cin.ignore();
    else if (x[i]!='#')
    cout<<x[i];
    }
    return 0;

    }

5).IOST5

#include <iostream>
using namespace std;
int main()
{
char a[100];
cin.get(a,100);
int x=0;
for(int i=0;a[i]!='\0';i++)
{
  if(a[i]=='s')
  {
    cout<<"sS";
  }
  else
  {
      cout<<a[i];
  }
  }
  if(x==1)
  {
      cout<<"std::cin.putback('S')";
      cout<<"cout.put";
  }
  return 0;
  }

6).IOST6

#include <iostream>
using namespace std;
int main()
{
char str[50];
std::cin.getline(str,50);
std::cout<<"the number of characters extracted are:"<<std::cin.gcount();
return 0;
}

7).IOST7

#include<iostream>
using namespace std;
int main()
{
    char ch;
    while ( cin.get(ch) )
    {
        if (ch == ' ')
          cin.putback('.');
       else
          cout << ch;
      while (cin.peek() == '#')
          cin.ignore(1,'#');
   }
    return 0;
}

8).IOST 8

#include <iostream>
using namespace std;

class demo {
public:
int dx, dy;

friend void operator >>(demo& d, istream& mycin)
{
mycin >> d.dx >> d.dy;
}
};

int main()
{
  demo d;
  operator >> (d,cin);
    cout << "dx=" << d.dx << " dy="<< d.dy;
}

9).IOST9

#include <iostream>
#include <string.h>
using namespace std;
int main() {
char a[500],b;
  cin.getline(a,30);
   b=strlen(a);
        cout<<"Your string is :";
        cout.write(a,b);
        cout<<endl;
        cout.write(a,10);
        cout<<endl;
        cout.write(a,b);
    return 0;
  }

10).IOST10

  #include <iostream>
  #include<string.h>
  using namespace std;
  int main() {
  char x[100];
  int a,j;
  // scanf("%[^\n]s",x);
  //int k=;
  cin.getline(x,30);
  cout<<"Your string is :";
  puts(x);
  // cout.write(x,10);
  for(a=0;a<=strlen(x);a++)
  {
    for(j=0;j<a;j++)
    {
    printf("%c",x[j]);
    cout.write(x,0);
    }
    cout<<endl;
  }
  return 0;
}

11).IOST11

    #include <iostream>
    #include <stdio.h>
    using namespace std;
    int main() {
        int t=2;
    while(t)
    {  char b[100];
    int i=0;
        cin.getline(b,30);
        cout.write(b,5);
            cout<<endl;
    t--;
    }
    return 0;
    }

12).IOST12

    #include <iostream>
    using namespace std;
    int main() {
    double pi;
        pi=(float)22/7;
        int n; cin>>n; int i;
        for( i=n;i>0;i--)
        {cout.precision(i); cout<<pi<<endl;} i++;
            cout<<"\n previous Setting:"<<i;
        return 0;
        }

13).IOST13

#include <iostream>
#include <string.h>
using namespace std;
int main() {
  int c,d;
char a[100],b[100];
  cin>>a;
  cout.width(20);cout.fill('*');
    cout<<a<<endl;

  cin>>b;
  cout.width(20);cout.fill('-');
    cout<<b<<endl<<endl<<"WEL DONE";//cout.fill,cout.width(20)
  return 0;
}

14).IOST14

#include <iostream>
using namespace std;

int main()
{
    float n;
    float pi;
    cin >> n;
    int i = 0;
    int n1 = n;
    while (n > 0)
    {
        pi=(float)22/7;
        cout.precision(n);
        cout << pi;
        while (i)
        {
            cout << '*';
            i--;
        }
        i = n1 - n + 1;
            n--;
        cout << endl;
        }
        cout << "3" << endl
            << "Fill Setting:*";

        return 0;
        }
        void d()
        {
            cout.fill('a');
            cout.width(10);
        }

15).IOST15

    #include <iostream>
    using namespace std;
    int main() {
        int a;
            cin>>a;
            cout.fill('*');
            cout.setf(ios::right,ios::adjustfield);
        cout.width(a);
        cout<<"SRM"<<endl;
        cout.fill('*');
        cout.setf(ios::left,ios::adjustfield);
        cout.width(a);
        cout<<"SRM";
    return 0;
    }

16).IOST16

#include <iostream>
using namespace std;
int main() {
int a;
double b=22/7;
cin>>a;
cout.fill('*');
cout.setf(ios::internal,ios::floatfield);
cout.setf(ios::internal,ios::scientific);
cout.width(a);
cout<<"3.141000e+00";

return 0;
}

17).IOST17

#include <iostream>
using namespace std; 
int main () { 
  long int a;
    cin>>a;
    cout.setf(ios::hex,ios::basefield );
    cout<<"Hexadecimal is:" <<hex<<a<<"\n";
    cout.setf(ios::oct,ios::basefield );
    cout<<"Octal is:"<<oct<<a<<"\n";
    cout.setf(ios::dec,ios::basefield );
    cout<<"Decimal is:"<<dec<<a;
    return 0; 
} 

18).IOST18

#include <iostream>
#include <iomanip>
using namespace std; 
int main () { 
  double a,b;
  int c,d;
    cin>>a>>b>>c>>d;
    cout.setf(ios::showpos);
    cout<<"SHOWPOS : "<<showpos<<a<<"\n";
    cout.setf(ios::showpoint);
    cout<<"Showpoint : "<<setprecision(6)<<showpoint<<b<<"\n";
    cout.setf(ios::hex);
    cout<<hex<<"Hexadecimal is : " <<c<<"\n";
    cout.setf(ios::uppercase);
    cout<<"UPPER CASE : "<<uppercase<<d;
    return 0; 
}

19).IOST19

#include<iostream>
using namespace std;
int main()
{
  int n,i,c=1;
  long double ans,s=1;
    cin>>n;
  for(i=1;i<=n;i++)
  {
    ans=s*c;
    cout.width(n);
    cout.setf(ios::fixed);
    cout.precision(0);
    cout<<ans<<"\n";
    s=ans;
  c++;
  }
return 0;
}