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:) greedy.c exists :( greedy.c compiles \ expected an exit code of 0, not standard error of "greedy.c:24:11: error: use of undeclare..." :| input of 0.41 yields output of 4 \ can't check until a frown turns upside down :| input of 0.01 yields output of 1 \ can't check until a frown turns upside down :| input of 0.15 yields output of 2 \ can't check until a frown turns upside down :| input of 1.6 yields output of 7 \ can't check until a frown turns upside down :| input of 23 yields output of 92 \ can't check until a frown turns upside down :| input of 4.2 yields output of 18 \ can't check until a frown turns upside down :| rejects a negative input like -.1 \ can't check until a frown turns upside down :| rejects a non-numeric input of "foo" \ can't check until a frown turns upside down :| rejects a non-numeric input of "" \ can't check until a frown turns upside down

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It means that there's an error with your code that must be fixed before it can continue checking things like Input of 0.41 yields output of 4. In this case, you must fix expected an exit code of 0, not standard error of "greedy:c:24:11:error: use of undeclare.... It sounds like you're using a variable or function that has not been declared yet.

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