Compilare: main.cpp: In function 'void read()': main.cpp:16:47: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'double*' [-Wformat=] scanf("%d%d",&x[i] ,&y[i]);// f>>x[i]>>y[i]; ^ main.cpp:16:47: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'double*' [-Wformat=] main.cpp:13:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trapez.in","r",stdin); ^ main.cpp:14:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:16:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x[i] ,&y[i]);// f>>x[i]>>y[i]; ^ main.cpp: In function 'void write()': main.cpp:36:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trapez.out" , "w", stdout); ^