Integers don't care whether 10 or 16, they are all binary in the machine.

Int i = 0x0b and int I =11; Everything in the machine says the same thing.

If you want to convert 10 radix into 16 radix described by characters, use sprintf, for example:

int I = 1 1；

char string[20]；

sprintf(str，" %02X "，I)；

printf("%s "，str)；