/in/foo.c: In function 'main':
/in/foo.c:5:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d",n);
          ^
/in/foo.c:7:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(i=1;i<=n;i++)
  ^~
/in/foo.c:7:8: error: expected ')' before ';' token
  if(i=1;i<=n;i++)
        ^
/in/foo.c:4:10: warning: variable 's' set but not used [-Wunused-but-set-variable]
  int n,i,s;
          ^