2005
Search results
static_cast vs dynamic_cast vs reinterpret_cast internals view on a downcast/upcast. In this answer, I want to compare these three mechanisms on a concrete upcast/downcast example and analyze what happens to the underlying pointers/memory/assembly to give a concrete understanding of how they compare.
Oct 29, 2009 · The OP wanted to convert a pointer value to a int value, instead, most the answers, one way or the other, tried to wrongly convert the content of arg points to to a int value. And, most of these will not even work on gcc4. The correct answer is, if one does not mind losing data precision, int x = *((int*)(&arg)); This works on GCC4.
A type cast is basically a conversion from one type to another. It can be implicit (i.e., done automatically by the compiler, perhaps losing info in the process) or explicit (i.e., specified by the developer in the code). The space occupied by the types is of secondary importance. More important is the applicability (and sometimes convenice) of ...
Mar 3, 2018 · SELECT CONVERT(decimal(30,13), 123.9900000000000); will never return the value '(Decimal('123.9900000000000'), 123.99)' as that is a varchar. In the first query, you can see I am retrieving discount value from the pricetable which is 123.99 and converting it to decimal with a scale of 13 and the result is Decimal ('123.9900000000000'). In the ...
61. In Java Integer uses 32 bits to represent its value. In Java a FLOAT uses a 23 bit mantissa, so integers greater than 2^23 will have their least significant bits truncated. For example 33554435 (or 0x200003) will be truncated to around 33554432 +/- 4. In Java a DOUBLE uses a 52 bit mantissa, so will be able to represent a 32bit integer ...
May 13, 2011 · Its not a loss of precision .3 is not representable in floating point. When the system converts to the string it rounds; if you print out enough significant digits you will get something that makes more sense. To see it more clearly. float f = 0.3f; double d1 = System.Convert.ToDouble(f);
Jan 8, 2010 · +1 for referencing intptr_t. It is a valid use case to cast things from void* to integer types if you have a generic function that takes (void *) because the a user can pass their own data which may be a pointer or an integer into it. When that user data then gets passed back to the specific code making use of it, it can cast it back to an integer.
May 17, 2014 · The cast in newData = (PointPair)data; (which is necessary) tells the compiler, "let me treat data as the PointPair it really is." This behavior is in contrast to, for instance, casting a long to an int. Value types (like numerical primitive types and C# structs) are stored by value, and they take varying amounts of space.
An unchecked cast, as opposed to checked cast, does not check type safety at runtime. Here's an example based on the Consider typesafe heterogenous containers section of the 3rd ed. of "Effective Java" by Joshua Bloch, but the container class is intentionally broken - it stores and returns the wrong type:
Sep 15, 2010 · I achieved this by adding CASE statement in the query as below; CASE WHEN float_field IS NULL THEN 'NA' WHEN float_field = 0 THEN '0' ELSE CONVERT(VARCHAR, float_field, 128) END AS float_As_VChar. 128 is deprecated but 3 seems to be the replacement for it in the most recent SQL Server releases.
