Compilare: user.cpp: In function ‘int main()’: user.cpp:49:16: warning: unused variable ‘ca’ [-Wunused-variable] int max = 0, ca, cb, a, b; ^ user.cpp:49:20: warning: unused variable ‘cb’ [-Wunused-variable] int max = 0, ca, cb, a, b; ^ user.cpp:41:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:43:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &v[i].x, &v[i].y, &v[i].z); ^