Compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: warning: format ‘%f’ expects argument of type ‘float*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%f%f",&xc,&yc); ^ user.cpp:13:25: warning: format ‘%f’ expects argument of type ‘float*’, but argument 3 has type ‘int*’ [-Wformat=] user.cpp:16:46: warning: format ‘%f’ expects argument of type ‘float*’, but argument 2 has type ‘double*’ [-Wformat=] scanf("%f%f",&v[i].first,&v[i].second); ^ user.cpp:16:46: warning: format ‘%f’ expects argument of type ‘float*’, but argument 3 has type ‘double*’ [-Wformat=] user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hawaii.in","r",stdin); ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hawaii.out","w",stdout); ^ user.cpp:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:13:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%f%f",&xc,&yc); ^ user.cpp:16:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%f%f",&v[i].first,&v[i].second); ^