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PO
primarykey
Id
19634020
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-28T11:46:46.977
FavoriteCount
0
LastActivityDate
2013-10-28T12:15:58.260
LastEditDate
2013-10-28T12:15:58.260
LastEditorUserId
1708801
OwnerUserId
1708801
ParentId
19633932
PostTypeId
2
Score
7
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0
LastEditorDisplayName
text
Body
the <code>%d</code> format specifier tells <code>printf</code> that you are passing in an int but in the first case you are passing in a double which is also <a href="http://en.wikipedia.org/wiki/Undefined_behavior" rel="nofollow noreferrer">undefined behavior</a> and so the results are not reliable. The result of: <pre><code>money+money*0.4 </code></pre> is double since a floating constant is double unless it has a suffix such as <code>f</code> and the results of the multiplication and addition are double as well due to the usual arithmetic conversions which both operations are subject to and which will cause the value of <code>money</code> to be converted to double for the operation. In the second case you are correctly passing in int and since you are assigning the result to <code>money</code>: <pre><code>money=money+money*0.4 </code></pre> it will truncate the double value. I am not sure what compiler you are using but both <code>clang</code> and <code>gcc</code> without any warning flags both warn about the incorrect format specifier, <code>gcc</code> for example says: <blockquote> warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat] </blockquote> So if you are not seeing any warning for that line you should look into setting your warning levels higher. For completeness sake the <a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf" rel="nofollow noreferrer">draft C99 standard</a> section <code>7.19.6.1</code> The fprintf function, which also covers <code>printf</code> with respect to the format specifiers, In paragraph 9 says: <blockquote> If a conversion specification is invalid, the behavior is undefined.248) If any argument is not the correct type for the corresponding conversion specification, the behavior is undefined. </blockquote>
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1. POUnexpected results when using printf
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1. PTAnswer
UserLastEditorUserId
1. USShafik Yaghmour
UserOwnerUserId
1. USShafik Yaghmour
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