C++ Tutorial/Data Types/int display

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Change width as you output

#include <iostream>
#include <iomanip>
using namespace std; 
int main(void){
   cout << setw(5) << 1 << "\n" << setw(6) << 2; 
   cout << "\n" << setw(7) << 3;
}

Displaying Leading Zeros

#include <iomanip>
#include <iostream>
using namespace std;
int main( )
{
   const int num_members = 6;
   const int id[num_members] = { 6, 5, 1, 8,3, 2 };
   const int month[num_members] = { 9, 1, 1, 12, 10, 4 };
   const int day[num_members] = { 2, 1, 13, 30, 31, 4 };
   const int year[num_members] = { 2000, 2003, 2004, 1998,2001, 2003 };
   cout << setfill( "0" );
   for( int i = 0; i < num_members; ++i )
      cout << ": " << setw( 8 ) << id[i]
         << " : " << setw( 2 ) << month[i] << "/"
         << setw( 2 ) << day[i] << "/" << setw( 2 )
         << year[i] % 100 << endl;
}

Line up columns of data with cout.width

#include <iostream>
using namespace std;
int main()
{
  cout << "Root | Square | Cube\n";
  for(int i = 1; i < 11; ++i) {
    cout.width(4);
    cout << i << " |";
    cout.width(7);
    cout << i * i << " |";
    cout.width(8);
    cout << i * i * i;
    cout << endl;
  }
  return 0;
}

Output decimal to hexadecimal, octal and align the output

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
   const int number = 185;
   cout << "The number is " << number << endl;
   cout << "The number is " << hex <<  number << endl;
   cout.setf(ios::showbase);
   cout << "The number is " << hex <<  number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout << hex << number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout.setf(ios::left);
   cout << hex << number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout.setf(ios::internal);
   cout << hex << number << endl;
   cout << "The number is:" << setw(10) << hex << number << endl;
   return 0;
}

Set cout for hex number output

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
   const int number = 185;
   cout << "The number is " << number << endl;
   cout << "The number is " << hex <<  number << endl;
   cout.setf(ios::showbase);
   cout << "The number is " << hex <<  number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout << hex << number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout.setf(ios::left);
   cout << hex << number << endl;
   cout << "The number is " ;
   cout.width(10);
   cout.setf(ios::internal);
   cout << hex << number << endl;
   cout << "The number is:" << setw(10) << hex << number << endl;
   return 0;
}

setiosflags(ios::left) and resetiosflags(ios::left)

#include <iostream>
#include <iomanip>
using namespace std; 
int main(void){ 
   cout.width(5);
   cout << setiosflags(ios::left) << 5 << "\n"; 
   cout.width(5);
   cout << 5 << "\n" << resetiosflags(ios::left); 
   cout.width(5);
   cout << 1;
}

Using various padding characters

#include <iostream>
#include <iomanip>
using std::cout;
using std::endl;
using std::ios;
using std::setw;
using std::hex;
using std::dec;
using std::setfill;
int main()
{
   int x = 10000;
   cout.setf( ios::right, ios::adjustfield );
   cout.fill( "*" );
   cout << setw( 10 ) << dec << x << "\n";
   cout.setf( ios::left, ios::adjustfield );
   cout << setw( 10 ) << setfill( "%" ) << x << "\n";
   cout.setf( ios::internal, ios::adjustfield );
   cout << setw( 10 ) << setfill( "^" ) << hex << x << endl;
   return 0;
}
Источник — «http://cppe.ru/index.php?title=C%2B%2B_Tutorial/Data_Types/int_display&oldid=3051»