Compilare: user.cpp: In function ‘int f_eval(int)’: user.cpp:39:28: warning: unused variable ‘sg’ [-Wunused-variable] int v[30],pos=-1,rez=0,sg=1,x; ^ user.cpp:39:33: warning: unused variable ‘x’ [-Wunused-variable] int v[30],pos=-1,rez=0,sg=1,x; ^ user.cpp: In function ‘int main()’: user.cpp:65:20: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[300]’ [-Wformat=] scanf("%s",&exp); ^ user.cpp:66:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[300]’ [-Wformat=] while(scanf("%s",&sir)!=EOF) ^ user.cpp:62:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.in","r",stdin); ^ user.cpp:63:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.out","w",stdout); ^ user.cpp:65:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&exp); ^