Usage of Standard Manipulator

// Standard manipulators usage
#include <iostream> 
#include <iomanip> 
int main( ) 
{   
    int i = 52 ;    
    float a = 425.0 ;
    float b = 123.500328f ;
    char str[ ] = "Dream. Then make it happen!" ;
    std :: cout << setiosflags ( std :: ios ::unitbuf | std :: ios ::showpos ) ;
    std :: cout << i << std :: endl ;
    std :: cout << setiosflags ( std :: ios ::showbase | std :: ios ::uppercase ) ;
    std :: cout << std :: hex << i << std :: endl ;
    std :: cout << std :: oct << i << std :: endl ;
    std :: cout << std :: setfill ( '0' ) ;
    std :: cout << "Fill character:" << std :: cout.fill( ) << std :: endl ;
    std :: cout << std :: dec << std :: setw ( 10 ) << i << std :: endl ;
    std :: cout << std :: setiosflags ( std :: ios ::left )
         << std :: dec << std :: setw ( 10 ) << i << std :: endl ;
    std :: cout << std :: setiosflags ( std :: ios ::internal )
         << std :: dec << std :: setw ( 10 ) << i << std :: endl ;
    std :: cout << i << std :: endl ;
    std :: cout << std :: setw ( 10 ) << str << std :: endl ;
    std :: cout << std :: setw ( 40 ) << str << std :: endl ;
    std :: cout << std :: setiosflags ( std :: ios ::left ) << std :: setw ( 40 ) << str << std :: endl ;
    std :: cout.precision ( 6 ) ;
    std :: cout << "Precision: " << std :: cout.precision( ) ;
    std :: cout << std :: setiosflags ( std :: ios ::showpoint ) << std :: resetiosflags ( std :: ios ::showpos )
         << std :: endl << a ;
    std :: cout << std :: resetiosflags ( std :: ios ::showpoint )
         << std :: endl << a ;
    std :: cout << std :: setiosflags ( std :: ios ::fixed ) << std :: endl << b ;
    std :: cout << std :: resetiosflags ( std :: ios ::showpoint | std :: ios ::unitbuf ) <<std :: endl ;
    return 0 ;
}