You are developing a COBOL program that reads data from an external file. What would you do if the file does not exist when you attempt to open it?
- Check the FILE STATUS after the OPEN statement
- Perform a manual check using IF conditions
- Use the INVALID KEY clause in the file control entry
- Utilize the EXIT PROGRAM statement
When attempting to open a file, using the INVALID KEY clause in the file control entry allows you to handle the situation where the file does not exist. You can specify a set of actions to be taken if the file opening fails, providing a mechanism for graceful error handling.
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