Debugging

The code below provides an opportunity to use the debugging facility. The code opens a file, sets a counter to 1 and then reads the records in the file and increments the counter. To check that the counter produces the correct value we can use the debugger as follows:

• Check the number of records in the file, which should be set to the number of records + 1.
• Click in the gutter to the left of the code opposite the line 'inc(next_cons)'.

• Choose View/Debug Windows/Watches (Ctrl/Alt/W).
• Press F9 to run the code, which will stop at the breakpoint you just set.
• from here press F8 to step through the code one line at a time.
• As the line 'inc(next_cons)' is executed the value in the watch window will change as the records are read and the counter is incremented.

The file here contained 2 records so the outcome of next_cons=3 is what we want.

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