Compilare: user.cpp: In function ‘int main()’: user.cpp:16:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hd%c",&n,&c); ^ user.cpp:19:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.cpp:40:24: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=1;i<=n;i++) if (p[i]==nr) fprintf(g,"%d ",v[i]); ^