Compilare: user.cpp: In function ‘int main()’: user.cpp:8:38: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 2 has type ‘double*’ [-Wformat=] scanf("%Lf%Lf%Lf%Lf",&wf,&hf,&wp,&hp); ^ user.cpp:8:38: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 3 has type ‘double*’ [-Wformat=] user.cpp:8:38: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 4 has type ‘double*’ [-Wformat=] user.cpp:8:38: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 5 has type ‘double*’ [-Wformat=] user.cpp:12:26: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 2 has type ‘double’ [-Wformat=] printf("%.2Lf %.2Lf",w,h); ^ user.cpp:12:26: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 3 has type ‘double’ [-Wformat=] user.cpp:5:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scalecrop.in","r",stdin); ^ user.cpp:6:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scalecrop.out","w",stdout); ^ user.cpp:8:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%Lf%Lf%Lf%Lf",&wf,&hf,&wp,&hp); ^