Question

How can I convert an integer to a hexadecimal string in C?

Example: The integer 50 would be converted to the hexadecimal string "32" or "0x32".

Answer 1

This code

int a = 5;
printf("%x
", a);

prints

5

---

This code

int a = 5; 
printf("0x%x
", a);

prints

0x5

---

This code

int a = 89778116;
printf("%x
", a);

prints

559e7c4

---

If you capitalize the x in the format it capitalizes the hex value:

int a = 89778116;
printf("%X
", a);

prints

559E7C4

---

If you want to print pointers you use the p format specifier:

char* str = "foo";
printf("0x%p
", str);

prints

0x01275744