/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: expected ',' or ';' before 'for'
  for(int k=1;k>=10;k++)
  ^~~
/in/foo.cc:6:14: error: 'k' was not declared in this scope
  for(int k=1;k>=10;k++)
              ^
/in/foo.cc:5:6: warning: unused variable 'a' [-Wunused-variable]
  int a,x=-9999999
      ^