Compilare: user.cpp: In function ‘int main()’: user.cpp:9:9: warning: unused variable ‘n’ [-Wunused-variable] int t, n, x; ^ user.cpp:9:12: warning: unused variable ‘x’ [-Wunused-variable] int t, n, x; ^ user.cpp:12:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:17:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^