/in/foo.c: In function 'main':
/in/foo.c:12:13: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
   scanf("%d%d",&b[i],a[i]);
             ^
/in/foo.c:42:14: warning: format '%d' expects a matching 'int' argument [-Wformat=]
  printf("%d/%d",b[n-1]/a[n-1]);
              ^