当尝试对空指针(null 或nullptr)进行算术运算时,编译器会发出此警告。 2. 警告含义 null used in arithmetic [-wpointer-arith] 警告表明代码中试图对空指针进行算术运算。在C和C++中,虽然指针算术是合法的,但对空指针进行算术运算通常没有意义,甚至可能是危险的,因为它可能导致未定义行为。 3. 可能导致警告的...
I know they say you shouldn't use null in arithmetic anyway, but I'm just using it as a quick fix, and it bugs me that i'm getting like 7 warnings for it and not any other errors or warnings. Besides whats the worse that could happen? Aug 11, 2010 at 3:23am helios (17607...
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NULL used in arithmetic Problem:I received the following warning:NULL used in arithmetic [-Wpointer-arith] Solution:In later C++ standards, NULL is no longer a simple macro that is defined to 0. To avoid possible issues, use the 0 constant value when you deal with non-pointer types. For ...
Define Null value. Null value synonyms, Null value pronunciation, Null value translation, English dictionary definition of Null value. adj. 1. Having no legal force; invalid: render a contract null and void. 2. Of no consequence, effect, or value; insign
Here, you can seeNonein the list of__builtins__which is the dictionary the interpreter keeps for thebuiltinsmodule. Noneis a keyword, just likeTrueandFalse. But because of this, you can’t reachNonedirectly from__builtins__as you could, for instance,ArithmeticError. However, you can get...
Let us compile and run the above program, this will produce the following result − Exception in thread "main" java.lang.NullPointerException: Cannot invoke "String.length()" because "name" is null at com.tutorialspoint.Tester.main(Tester.java:8) ...
Beginning with C# 13, the Index from the end operator can be used in an object initializer. Range operator.. The..operator specifies the start and end of a range of indices as its operands. The left-hand operand is aninclusivestart of a range. The right-hand operand is anexclusiveend ...
In expressions using arithmetic operators, if any of the operands is null, the result is null as well.Nulls and SqlBooleanComparison between any System.Data.SqlTypes will return a SqlBoolean. The IsNull function for each SqlType returns a SqlBoolean and can be used to check for null values...
Because the result of any arithmetic comparison with NULL is also NULL, you cannot obtain any meaningful results from such comparisons. In MySQL,0 or NULL means false and anything else means true.The default truth value from a boolean operation is 1. ...