Q31273: INPUT X% Statement Gives No "Type Mismatch" for d, e, !, or

Article: Q31273
Product(s): See article
Version(s): 3.00 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist3.00 buglist4.00 buglist4.00b buglist4.50 | mspl13_basic
Last Modified: 21-SEP-1990

A "Type Mismatch" error does not occur if the INPUT statement receives
any of the following noninteger-type symbols in an integer variable:

1. d (double-precision exponential)

2. e (exponential)

3. ! (single-precision exponential)

4. # (double-precision exponential)

Instead, a value of 0 (zero) is input. QuickBASIC automatically
converts the noninteger-type symbol to zero (0) instead of giving a
"Type Mismatch" error message.

Microsoft has confirmed this to be a problem in QuickBASIC versions
3.00, 4.00, 4.00b, and 4.50 for MS-DOS; in Microsoft BASIC Compiler
versions 6.00, 6.00b (buglist6.00, buglist6.00b) for MS-DOS and MS
OS/2; in Microsoft BASIC Professional Development System versions 7.00
and 7.10 for MS-DOS and OS/2 (buglist7.00, buglist7.10); and in
Microsoft GW-BASIC Interpreter versions 3.20, 3.22, and 3.23
(buglist3.20, buglist3.22, buglist3.23) for MS-DOS. We are researching
this problem and will post new information here as it becomes
available.

Note: The "Type Mismatch" error message occurs in the above products,
except for BASIC PDS 7.00 and 7.10, if you input only a percent sign
("%", which marks integer constants) in response to INPUT for an
integer variable. In BASIC PDS 7.00 and 7.10, a % is correctly input
with a value of zero.

The following code demonstrates the above problem:

' A value of zero is input if the following noninteger-type
' characters are input into an integer variable: d (double exponential),
' e (single precision exponential), !, and #
INPUT "ENTER AN INTEGER ",i%
PRINT i%
END

Additional reference words: B_GWBasicI B_BasicCom

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