Gradescope Error Codes

The numerical error codes reported on Gradescope in the form

test program error: exited with error code 142"

are formed by 128+N where N is a standard Unix signal number, which you can list by running the terminal command

kill -l

In this example 142−128=14 , which is SIGSEGV, corresponding to the segmentation fault. Here is a short annotated list of the most common failures.

134

Assertion failure

136

Floating point error

139

Segmentation fault

142

Timeout expired