Compilare: user.cpp: In function ‘int prod(int (*)[7], int (*)[7])’: user.cpp:21:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b,c,x1,x2,n; ^ user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.in","r",stdin); ^ user.cpp:26:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.out","w",stdout); ^ user.cpp:27:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d",&a,&b,&c,&x1,&x2,&n); ^