Compilare: user.cpp: In function ‘int main()’: user.cpp:32:12: warning: unused variable ‘nr’ [-Wunused-variable] int n, i, nr, x,j,sum=0; ^ user.cpp:32:16: warning: unused variable ‘x’ [-Wunused-variable] int n, i, nr, x,j,sum=0; ^ user.cpp:35:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%d", &a, &b, &c, &n); ^ user.cpp:38:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &v[i]); ^