/in/foo.c: In function 'main':
/in/foo.c:11:13: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
     scanf("%d",ar[i]);
             ^
/in/foo.c:5:13: warning: variable 'da' set but not used [-Wunused-but-set-variable]
     int n,i,da;
             ^~