/in/foo.c: In function 'main':
/in/foo.c:6:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d",n);
          ^
/in/foo.c:7:18: error: expected ')' before ';' token
  for(i=1;i<=n;i++;){
                  ^
/in/foo.c:8:5: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  k=k+i^2;
    ~^~