power-peg

Repair this code

Repair the router so test mode places no orders (returns 0) instead of firing the reactivated Power Peg routine.

today's brief

August 1, 2012. Knight Capital rolls out new trading code to eight servers, but one server still carries a retired routine called Power Peg, and a reused flag wakes it up. For 45 minutes that machine fires orders it was never meant to send, 4 million trades, and the firm loses 440 million dollars and nearly dies before lunch. Here is the same trap in miniature: in test mode the dead code fires real orders. Make test mode do nothing.

See it in action

orders_to_send(100, 0)

Expected result

Your checklist

For your own tracking. Tests grade your code.

In normal mode (is_test is 0), return shares: the real order size.
In test mode (is_test is 1), place nothing at all: return 0.
The starter fires a runaway order in test mode. Fix that one line.

More examples

orders_to_send(100, 1)

Expected result

orders_to_send(250, 0)

Expected result

Constraints

Expected files

orders.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

power-peg

Repair this code

Repair the router so test mode places no orders (returns 0) instead of firing the reactivated Power Peg routine.

today's brief

See it in action

orders_to_send(100, 0)

Expected result

Your checklist

For your own tracking. Tests grade your code.

In normal mode (is_test is 0), return shares: the real order size.
In test mode (is_test is 1), place nothing at all: return 0.
The starter fires a runaway order in test mode. Fix that one line.

More examples

orders_to_send(100, 1)

Expected result

orders_to_send(250, 0)

Expected result

Constraints

Expected files

orders.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions