Compilare: main.cpp: In function 'void scanPt(Point&)': main.cpp:24:31: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=] scanf("%llf%llf",&P.x,&P.y); ^ main.cpp:24:31: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=] main.cpp: In function 'void display()': main.cpp:48:33: warning: format '%f' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=] printf("%.5f",abs(surface)/2); ^ main.cpp: In function 'void scanPt(Point&)': main.cpp:24:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llf%llf",&P.x,&P.y); ^ main.cpp: In function 'void read()': main.cpp:29:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp: In function 'int main()': main.cpp:53:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aria.in","r",stdin); ^ main.cpp:54:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out","w",stdout); ^