Compilare: user.c: In function ‘scadere_1’: user.c:103:12: warning: comparison between pointer and integer [enabled by default] if(a[0]==NULL) ^ user.c: In function ‘main’: user.c:113:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.c:114:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&x); ^ user.c:116:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",n); ^