preserve eax in a "C++" void f(int* a); routine

if I have the routine
void f(int* a);
I have to save eax or not: example

; void f(int* a);
; 0eax, 4Ra, 8 Pa
f:
push eax
mov eax, [esp+8]
mov dword [eax], 900
pop eax
ret

and

;void g(int* a);
; 0Ra, 4Pa
g:
mov eax, [esp+4]
mov dword [eax], 900
ret

If f() and g() are called from a C or a C++ programme,
It is better f() or g() ?

.

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