/in/foo.cc: In function 'int main()':
/in/foo.cc:54:6: error: 'i' was not declared in this scope
  for(i=0; i<a; i++)
      ^
/in/foo.cc:73:6: error: 'i' was not declared in this scope
  for(i=0; i<a; i++)
      ^
/in/foo.cc:92:6: error: 'i' was not declared in this scope
  for(i=0; i<a; i++)
      ^
/in/foo.cc:111:6: error: 'i' was not declared in this scope
  for(i=0; i<a; i++)
      ^