Question

In my program I try to convert a int to a char[20];

I try to do this in the following way:

  char str[20];    
  sprintf(str, "%d", timer);

in which timer is the int.

But when I build this code, I get the following warnings.

Type implicit declaration of function 'sprintf' [-Wimplicit-function-declaration]   
incompatible implicit declaration of built-in function 'sprintf' [enabled by default]   

what does that mean?

note:( I have included string.h and stdlib.h).

---

great, I added stdio.h to my code and now the warnings disappeared only to give me a even harder error.

undefined reference to `_sbrk’

Answer 1

You have to #include <stdio.h> to use sprintf()