Compilare: user.cpp: In function ‘int main()’: user.cpp:17:13: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int a,b,x,y,z; ^ user.cpp:17:15: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] int a,b,x,y,z; ^ user.cpp:17:17: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int a,b,x,y,z; ^ user.cpp:18:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jap2.in","r",stdin); ^ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jap2.out","w",stdout); ^ user.cpp:20:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&p,&q); ^ user.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&a,&b); ^