Compilare: user.cpp: In function ‘int main()’: user.cpp:32:9: warning: unused variable ‘x’ [-Wunused-variable] int x ,n ,i ,j; ^ user.cpp:34:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin ,"%d" ,&n); ^ user.cpp:37:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin ,"%lf" , &z); ^