Compilare: user.c: In function ‘main’: user.c:17:17: warning: unused variable ‘suma’ [-Wunused-variable] int i,j,n,k,suma=0,a; ^ user.c:17:15: warning: unused variable ‘k’ [-Wunused-variable] int i,j,n,k,suma=0,a; ^ user.c:18:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d ",&n); ^ user.c:21:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a); ^