Compilare: user.cpp: In function ‘int main()’: user.cpp:36:5: warning: unused variable ‘pp’ [-Wunused-variable] int pp=1; ^ user.cpp:21:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pipe.in","r",stdin); ^ user.cpp:22:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pipe.out","w",stdout); ^ user.cpp:27:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d%d%c",&n,&xi,&yi,&xf,&yf,&spatiu); ^ user.cpp:30:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%c%d%c",&v[i].cul,&v[i].val,&spatiu);} ^