/in/foo.c: In function 'main':
/in/foo.c:7:18: error: expected ')' before '{' token
  for(i=1;i<=n;i++{
                  ^
/in/foo.c:16:1: error: expected expression before '}' token
 }
 ^
/in/foo.c:4:14: warning: unused variable 'k' [-Wunused-variable]
 {int n,x,i,j,k;
              ^
/in/foo.c:4:12: warning: variable 'j' set but not used [-Wunused-but-set-variable]
 {int n,x,i,j,k;
            ^