Compilare: user.cpp: In function ‘int ksir(int&)’: user.cpp:23:27: warning: NULL used in arithmetic [-Wpointer-arith] while (s[p]!=','&&s[p]!=NULL&&s[p]!=')'&&s[p]!=']') ^ user.cpp: In function ‘int main()’: user.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(s);i++) ^ user.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(s);i++) ^