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

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\n", a); 

prints

5 

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This code

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

prints

0x5 

---

This code

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

prints

559e7c4 

---

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

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

prints

559E7C4 

---

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

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

prints

0x01275744