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What are the advantages of using Unions in a structure in C?
In case of structure each variables have their own storage location whereas for unions all the variables share a common memory location. In structure all the variables can be handled at a time but for union only a member can be handled at a time.
Can two different pointer variables point to the same memory location?
Yes, two different pointer variables may point to the same memory location. Two issues, though... If your code thinks the two pointers represent two different allocations of memory, then you risk deallocating one and not realizing that the other is now invalid. You need to make sure that your compiler optimization settings for volatility are correct, otherwise the compiler could generate code that does not always work correctly.
How can you check whether the contents of two structure variables are same or not?
When structures are passed as arguments to functions, the entire structure is typically pushed on the stack, using as many words as are required. (Programmers often choose to use pointers to structures instead, precisely to avoid this overhead.) Some compilers merely pass a pointer to the structure, though they may have to make a local copy to preserve pass-by-value semantics. Structures are often returned from functions in a location pointed to by an extra, compiler-supplied ``hidden'' argument to the function. Some older compilers used a special, static location for structure returns, although this made structure-valued functions non-reentrant, which ANSI C disallows.
What are variables in programming?
In computer programming, variables refer to a particular location in the memory that holds a value. Variables are equivalent to their assigned values.
What is the definition of a control variable?
Variables are simply names used to refer to some location in memory - a location that holds a value with which we are working. It may help to think of variables as a placeholder for a value. in system
What is symbol table in system programming?
In computer science, a symbol table is a data structure used by a language translator such as a compiler or interpreter, where eachidentifier in a program's source code is associated with information relating to its declaration or appearance in the source, such as itstype, scope level and sometimes its location
Which is better in structure or class?
It depends on your requirements. A structure contains other objects (variables) within it. You cannot write methods in a structure. It is used as a data storage mechanism. When passed as an argument to another method, the entire contents of the structure is copied (this means that any changes you make to the structure in that method only apply to the local copy). A class contains both objects (variables), and methods that interact on those variables. Classes are the fundamental building block of object orienated applications. When passed as an argument to another method, only the pointer (or memory location) of the object is passed to the method (this means that any changes you make to the object will be visible in the original method as well, since there is only one copy of it).
Any file and acirc and 128 and 153s attribute information is stored in which structure on the disk?
The file's attribute information is stored in the file's metadata, which is typically saved in the file system directory. This data structure includes details such as file ownership, permissions, location on the disk, timestamps, and other attributes related to the file.
When variables are declared in the body of a method they are know as what?
Local Variables There are two types of variables based on the location of declaration 1. Instance Variables- Declared inside a class, but outside of any method's body. 2. Local Variables- Declared inside a method's body inside a class.
What are the differences between C and Java reference variables?
Java does not have the concept of Reference Variables. We cannot access the memory location where the data is stored in Java.
Can you explain the difference between pointers and variables in programming languages?
In programming languages, variables are used to store data values, while pointers are variables that store memory addresses of other variables. Variables directly hold data, while pointers hold the location of where data is stored in memory.
What are the contolled variables in spallanzani's experiment?
flasks, broth, time, location, time, temperature.
