Using hex, oct, dec and setbase stream manipulators. : cout dec oct hex « Development « C++ Tutorial

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2. Development
3. cout dec oct hex

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
   int n;

   cout << "Enter a decimal number: ";
   cin >> n;

   cout << n << " in hexadecimal is: " 
        << hex << n << '\n'
        << dec << n << " in octal is: " 
        << oct << n << '\n'
        << setbase( 10 ) << n << " in decimal is: " 
        << n << endl;

   return 0;
}