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The CONV, or conversion, error condition may be specified at the end of a program statement, in the Exit statement and with the ON error statement.

Error Traps:

CONV traps the following four conversion errors:

1.) A numeric input field contains non-numeric characters or vice versa.
2.) The number is too big for the field.
3.) The I/O list item is numeric where the FORM format specification indicates a string, or visa-versa.
4.) A negative value is being input or output, but the PIC format specification does not specify a sign (negative symbol).