Compilare: main.c: In function 'main': main.c:11:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^~~~~~~~~~~~~~~~~~~ main.c:22:5: warning: 'vmax' may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j=i;j<vmax && nrm<k;j+=i){ ^~~