Octal - Hexadecimal - Decimal conversion

#include <iostream.h>
#include <iomanip.h> 
int main()
{
cout<<"The decimal value of 15 is "<<15<<endl;
cout<<"The octal value of 15 is "<<setiosflags(ios::oct)<<15<<endl;
cout<<"The hex value of 15 is "<<setiosflags(ios::hex)<<15<<endl;

return 0;

}