std::setbase is a stream manipulator to change the output of numbers to the octal, decimal or hexadecimal number system.

Download the Qt Creator project 'CppSetbase' (zip)


#include <iostream>

#include <iomanip>

int main()

{

  for (int i=0; i!=20; ++i)

  {

    std::cout

      << std::setbase(10) << i << "(dec) "

      << std::setbase(8)  << i << "(oct) "

      << std::setbase(16) << i << "(hex)"

      << '\n';

  }

}

Screen output:


0(dec) 0(oct) 0(hex)

1(dec) 1(oct) 1(hex)

2(dec) 2(oct) 2(hex)

3(dec) 3(oct) 3(hex)

4(dec) 4(oct) 4(hex)

5(dec) 5(oct) 5(hex)

6(dec) 6(oct) 6(hex)

7(dec) 7(oct) 7(hex)

8(dec) 10(oct) 8(hex)

9(dec) 11(oct) 9(hex)

10(dec) 12(oct) a(hex)

11(dec) 13(oct) b(hex)

12(dec) 14(oct) c(hex)

13(dec) 15(oct) d(hex)

14(dec) 16(oct) e(hex)

15(dec) 17(oct) f(hex)

16(dec) 20(oct) 10(hex)

17(dec) 21(oct) 11(hex)

18(dec) 22(oct) 12(hex)

19(dec) 23(oct) 13(hex)

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(C++) std::setbase