Compilare: user.c:16:5: warning: conflicting types for built-in function ‘exp’ [enabled by default] int exp(){ ^ user.c: In function ‘exp’: user.c:17:5: warning: implicit declaration of function ‘term’ [-Wimplicit-function-declaration] int f=term(); ^ user.c: In function ‘term’: user.c:28:5: warning: implicit declaration of function ‘fact’ [-Wimplicit-function-declaration] int f=fact(); ^ user.c: In function ‘main’: user.c:52:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ user.c:53:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^ user.c:54:9: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] gets(str); ^ /tmp/ccaKOCvf.o: In function `main': user.c:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.