Compilare: user.cpp: In function ‘int main()’: user.cpp:19:10: warning: unused variable ‘m’ [-Wunused-variable] int n,x,m; ^ user.cpp:24:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%d%c", &x,&c); ^ user.cpp:30:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%d%c", &x,&c); ^ user.cpp:21:3: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=1;i<=n;i++) ^