Compilare: user.c: In function ‘upd’: user.c:7:13: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] i+=i&(i-1)^i; ^ user.c: In function ‘main’: user.c:21:9: warning: unused variable ‘k’ [-Wunused-variable] int k,i,m,c,a,b,x; ^ user.c:23:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.c:25:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^ user.c:30:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c); ^ user.c:32:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a,&b); ^ user.c:36:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a,&b); ^