hex - What is a better way to convert C++ decimal int to hexadecimal char?

Question

What is a better way to convert C++ decimal int to hexadecimal char?

UPDATE:
For example, 17 I hope that the result after the change is char(0x00) char(0x11)
but not "11" char("1") char ("1")

Answer 1

A friend who is engaged in embedded technology recommended a method

x & 0xFF; x >> 8

Answer 2

int a=11123456;
char str[20]={0};
sprintf(str, "%x", a);