Compilare: user.cpp: In function ‘int main()’: user.cpp:14:41: warning: unused variable ‘ok’ [-Wunused-variable] fscanf( input_file, "%d", &N ); int ok = 1; ^ user.cpp:14:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d", &N ); int ok = 1; ^ user.cpp:17:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d", &V[i] ); ^