#include <iostream>
#include <iomanip>

using namespace std;

//*******************************************************

// difference between character 2 and integer 2
// showing examples of modifiers: dec, hex, showbase, and setfill

int main()

{

char ch = '2';
int i = 2;
int j;

cout << ch << " is a digit: " ;

if (isdigit(ch))
  cout << "yes" << endl;
  else
  cout << "no"  << endl;

cout << i << " is a digit: " ;
if (isdigit(i))
  cout << "yes" << endl;
  else
  cout << "no"  << endl;

cout << endl;

cout << setfill('0');

cout << "IBM style:" << endl;
cout << ch  << " = x'" << hex << setw(2) << (int) ch << "'" << dec << endl;
cout <<  i  << " = x'" << hex << setw(2) << (int)  i << "'" << dec << endl;

cout << endl;
cout << "Unix style:" << endl;
cout << showbase;

cout << ch  << " = " << hex << setw(2) << (int) ch << dec << endl;
cout <<  i  << " = " << hex << setw(2) << (int)  i << dec << endl;
cout << endl << endl;

//  showpos

 i = 123;
 j = -123;

 cout << setfill(' ');
 cout << "default:  " << setw(10) << i << setw(10) << j << endl;
 cout << showpos;
 cout << "showpos:  " << setw(10) << i << setw(10) << j << endl;
 cout << noshowpos;
 cout << endl << endl;

//  showpoint

 float f1 = 123.;
 float f2 = -123.;

 cout << fixed << setprecision(0);
 cout << "fixed (0):" << setw(10) << f1 << setw(10) << f2 << endl;
 cout << showpoint;
 cout << "showpoint:" << setw(10) << f1 << setw(10) << f2 << endl;
 cout << noshowpoint;
 cout << endl;

 cout << scientific << setprecision(1);
 cout << "sci (1):  " << setw(10) << f1 << setw(10) << f2 << endl;
 cout << showpoint;
 cout << "showpoint:" << setw(10) << f1 << setw(10) << f2 << endl;
 cout << noshowpoint;
 cout << endl;


}
  
/*******************************************************

2 is a digit: yes
2 is a digit: no

IBM style:
2 = x'32'
2 = x'02'

Unix style:
2 = 0x32
2 = 0x2


default:         123      -123
showpos:        +123      -123


fixed (0):       123      -123
showpoint:      123.     -123.

sci (1):     1.2e+02  -1.2e+02
showpoint:   1.2e+02  -1.2e+02
  
*/