Compilare: user.c: In function ‘main’: user.c:43:24: warning: unused variable ‘j’ [-Wunused-variable] int m,n,i,*begin,*end,j; ^ user.c:46:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in,"%d %d",&n,&m); ^ user.c:50:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in,"%ld",&v[i]); ^ user.c:53:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in,"%ld",&w[i]); ^ user.c: In function ‘functie’: user.c:36:9: warning: ‘sum2’ may be used uninitialized in this function [-Wmaybe-uninitialized] *sum = sum2; ^