What is double evaluation?

Double OGNL evaluation allows attackers to evaluate arbitrary OGNL expressions when controlling the output of the first evaluation. The application uses a forced OGNL expression ( %{expr} ) in a Struts tag that evaluates the OGNL expression twice.

What is double evaluation in C?

Simply put, passing an expression as an argument to your function-like macro, Max will potentially evaluate that expression twice, because the expression will be repeated where ever the macro parameter it takes on, is used in the macro’s definition.

What are the two types of macros?

Types of macros

• Executive macros.
• Declarative macros.

What is forced OGNL evaluation?

The Apache Struts framework, when forced, performs double evaluation of attributes’ values assigned to certain tags attributes such as id. It is therefore possible to pass in a value to Struts that will be evaluated again when a tag’s attributes are rendered.

What is difference between macro and function?

Macros are pre-processed which means that all the macros would be processed before your program compiles. However, functions are not preprocessed but compiled….Conclusion:

Macro	Function
Macro is Preprocessed	Function is Compiled
No Type Checking is done in Macro	Type Checking is Done in Function

What is macro give example?

Macro is defined as something that covers a large amount, or is large in size. An example of macro is the study of the key driving aspects of an economy; macro economics. An example of macro is a very close up photograph of an ant; a macro photograph. adjective.

How macro is defined?

A macro is an automated input sequence that imitates keystrokes or mouse actions. A macro is typically used to replace a repetitive series of keyboard and mouse actions and used often in spreadsheets and word processing applications like MS Excel and MS Word. The file extension of a macro is commonly .

Is a macro a function?

Macros are typically faster than functions as they don’t involve actual function call overhead….Conclusion:

Macro	Function
Macros are useful when small code is repeated many times	Functions are useful when large code is to be written
Macro does not check any Compile-Time Errors	Function checks Compile-Time Errors

What is macro example?

How to define Cube and double macros in C?

Following this rule, the cube and double macros can be defined as: The two assignment statements above will then expand to: which will do what the programmer originally expected. You may remember that some macros I presented in earlier chapters don’t have so many parentheses.

How to avoid the pitfalls of macros?

This simple text expansion requires care that the context of a macro expansion doesn’t cause the resulting expression to have an unexpected meaning. You can avoid many problems with macros by following a simple rule: Put parentheses (or other explicit delimiters) around the macro text and around each macro argument within the macro text.

How are logical expressions evaluated in a C macro?

The “trick” to this macro is the C standard that logical expressions are always evaluated using left-to-right, “short-circuit” evaluation. Thus, ( ! ( sts ) ) is evaluated first, and if sts is zero (false), the whole logical expression is true, and the second part (the printf) is never evaluated.

How to use the VBA evaluate function in Excel?

1 VBA Evaluate. The Excel VBA Evaluate function converts a Microsoft Excel Name to an object or a value. 2 Use Evaluate brackets instead of Range. Did you know you can encapsulate Excel formulas in VBA in brackets to achieve the same results are embracing them within the Evaluate function? 3 Array definition using VBA Evaluate.