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A reference is simply an alias, an alternate name that we assign to a memory address that contains an object or primitive data type. In other words, it's a name that we use to refer to an object that resides in memory. It's a bit like a pointer variable, but it is not a variable in any sense of the word. References do not have any memory allocated to them and therefore you cannot store a reference. In other words, you cannot reference references, you cannot point to references and cannot create arrays of references.
Unlike pointers, references can never be NULL (a NULL reference invalidates your program). They must always refer to a valid object in memory. Therefore the object must physically exist in memory before it can be referenced. This is why the malloc() function in C/C++ always returns a pointer, not a reference. If the allocation failed for any reason, the object would not exist so no reference can be returned.
When you assign an object to a reference, you cannot then re-assign that same reference to another object while the reference remains in scope. However, you may assign several references to the same object. This is essentially what it means to pass an object to a function by reference. The function uses a local reference to refer to the object that you passed.
Many people regard pointers and references as being the same thing. After all, anything you can do with a reference you can also do with a pointer. But while it is true that compilers often implement references with pointers that is only of concern to compiler programmers. To ordinary programmers they are completely different concepts. A pointer is a variable that may contain a memory address while a reference is the memory address itself. Since a pointer is a variable it has a memory address of its own, and can therefore be referenced. But a reference has no memory of its own and therefore cannot be pointed at (you can only point at the memory being referenced, not the reference itself).
What else can I help you with?
What is meant by the object is stationary?
Stationary is only meaningful in regard to a defined "Reference Frame", or "Point of Reference". The object is not moving relative to that Frame or Point.
What is The distance between an object and a reference point is the object's?
The distance between an object and a reference point is the object's displacement from the reference point. It is typically measured in a straight line from the reference point to the object.
What is meant by frequency of 0.1 khz?
It means that the wave (or Object) in reference is repeating itself with the rate of 100 Cycles (or times) per second.
When an object is seen moving in relation to a stationary object is the stationary object is called the frame of reference or reference point?
It can be.
Why you use the reference variable?
The reference variable controls an object. Without the reference variable, you would have no way of accessing the object.
A place or object used for comparing the movement of an object?
A reference point is a place or object used for comparing the movement of another object. It helps to determine the position or speed of the object in relation to the reference point.
Effect of assigning one object reference variable to another object reference variable?
In that case, both variables will point to the same object. Changes done through one object reference will also be visible if you access the object through the other object reference.In that case, both variables will point to the same object. Changes done through one object reference will also be visible if you access the object through the other object reference.In that case, both variables will point to the same object. Changes done through one object reference will also be visible if you access the object through the other object reference.In that case, both variables will point to the same object. Changes done through one object reference will also be visible if you access the object through the other object reference.
What is meant by the terms rest and motion?
Rest refers to an object not changing its position relative to a reference point, while motion refers to a change in position of an object relative to a reference point over time. Objects can be in either a state of rest or motion depending on whether they are stationary or moving.
Why do you need a reference to know that an object is in motion?
A reference frame is needed to determine an object's motion because motion is relative. An object is in motion only when compared to another object or a specific frame of reference. Without a reference point, it's impossible to determine if an object is moving or stationary.
When an object is seen moving in relation to a stationary object the stationary object is called the frame of reference or reference point?
Yes, the stationary object is called the frame of reference, or reference point, because it provides a fixed point that is used to describe the motion of the moving object. By observing how the moving object changes position in relation to the stationary object, we can analyze its motion.
What is the difference between reference and hashcode?
There is no relation between reference and hascode, Java reference is unique pointer which refers an object. so each object will have a unique reference. but 2 diff object can have same hashcode.
When an object is seen moving in relation to a stationary object the stationary object is called the frame of reference or reference point.?
This is usually called a reference point. Frame of reference is not an incorrect term, but it is used less frequently.
