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What type of a variable is used to indirectly return multiple results by a function?
To return multiple values of the same type, return an array. If the values are different types, return a tuple or data structure. To return values indirectly, return a pointer to the results (arrays implicitly convert to pointers, but tuples and data structures do not). A returned pointer must never refer to a local variable of the returning function; upon return, those variables will cease to exist, resulting in undefined behaviour. To avoid this, the caller may provide a user-defined storage location via an output argument, or the function may allocate the return values on the free store (the heap).
What else can I help you with?
How can I initialize a type that is a pointer to a struct in Go?
For the purpose of clarification, you cannot initialise types, you can only initialise variables (or constants) of a type. A variable (or constant) is known as an "instance" or "object" of the type. All instances of a type must be named. A pointer variable allows us to "refer" to a named object of the pointer's type. this is achieved by storing the memory address (the starting address) of that object. By changing the address stored in the pointer variable, the same pointer variable can be used to refer to different objects in memory. This is useful when passing objects to functions because if we pass objects directly (by name), the function receives a copy of the object. This is known as "pass by value". However, when a function expects a pointer variable rather than a named variable, the address of the object is copied instead. This is known as "pass by reference" and allows the function to operate (indirectly) upon the object being referenced rather than a copy of the object (any changes to a copy are not reflected in the original object). Passing by reference is particularly useful when the object is large and complex. To improve efficiency, we must avoid making any unnecessary copies of large or complex objects. Functions that do not modify an object are a prime example; there is no point in copying an object that will not be modified. If we wish a function to modify the object, we must pass the object by reference. The only time we should copy an object is when we're not interested in the modifications made by a function, or when we want to compare the changes that were made. In these cases we simply make a copy of the object before passing that copy to the function by reference. When working with concurrency, however, it is best to use pass by value semantics. In this way, each thread works with a local copy of your object, and thus avoids "race conditions", where one task is accessing an object that is being modified by another task, which can lead to unpredictable results. Pointer variables are said to "point at" the memory the refer to (hence they are called pointers). To access the value being pointed at, the pointer variable must be dereferenced. However, in the case of pointer to struct variables, the dereferencing is transparent. All variables in Go are implicitly initialised with the default "zero" value for its type. The zero value of a pointer variable is always "nil" (regardless of which type of pointer). You must never dereference a pointer variable that holds the nil value so always check the pointer is non-nil. Equally, you must never dereference a pointer to an object that no longer exists in memory. Always nil your pointers as soon as you are finished with them. The following example demonstrates how to initialise a pointer variable to a struct: package main import "fmt" type Point struct { X int Y int } func main () { v := Point{1, 2} // instantiate an object of type Point p := &v // assign the address of v to pointer p (p's type is inferred from v) fmt.Println(*p) // print the indirect value of v (dereference p) }
How can you measure internal resistance of car battery?
You measure it indirectly using a known load resistance and measuring supplied current. Loading of the ammeter should be known as well, and the load resistance should be made relatively small to get accurate results.
How are pointer different from other variables?
A pointer variable is a variable that contains the memory location of another variable or an array (or anything else in memory). Effectively, it points to another memory location. For standard variables, you define a type, assign a value to that variable or read the value from it, and you can also read the memory location (&n = memory location of n) of the variable. For pointers, you can point them to any variable, even another pointer, and you can get the value of the variable it points to (*p), the location of that variable in memory (p), or the address in memory of the pointer itself (&p). Consider: long n = 65; long *p; p = &n; Results: Type | Name | Location | Value long n 0xA3FF 65 long * p 0x31DF 0xA3FF So p points to n. Now, n = 65 &n = 0xA3FF p = 0xA3FF *p = 65 &p = 0x31DF You may find yourself having to use typecasts frequently when using pointers. Pointers are useful when passing data to functions. For instance, consider the following function: void add(int a, int b, int c) { c = a + b; } The problem here is that the computer copies each variable into a new memory location before passing them to the function as local variables. This function effectively does nothing. However, if you change the function to: void add(int a, int b, int *c) { c = a + b; } and call the function by passing in the location of the variable to the function: add(a,b,&c); then you can modify the variable itself. Pointers are also good for working with arrays: char *c = "Hello World"; int i=0; while (c[i] != 0x00) { cout << c[i]; c++ } //print one letter at a time.
What is Stand alone results and consolidated results?
standalone results = results of the parent company alone & consolidated results = results of the parent company + its subsidiaries
Why does programmer need variable?
Variables can maintain the same value throughout a program, or they can change values several times, depending on your needs. when you put a variable in a program, the computer recognises the variable and you can change it's value throughout without an error. Note: You can write programs without variables, but their functionality will be quite restricted, like this: int main (void) { puts ("hello, world"); return 0; }
How do you identify the range of a function?
The range of a function is the interval (or intervals) over which the independent variable is valid, i.e. results in a valid value of the function.
What is the function of a control in a scientific investigation?
You establish a controlled variable from which you can compare your results from your experimental variables.
A function takes in values of variable called inputs and gives back values of the variable called outputs?
No. A function takes in values of no, one, or more input variables, and returns no or one result. It cannot return more than one result. Do not confuse this with returning multiple results using call by reference parameters - this is not the same thing.
Why in a experiment only one variable should be changed?
Changing only one variable in an experiment allows researchers to clearly determine the effect that variable has on the outcome. If multiple variables are changed, it becomes difficult to identify which variable is responsible for the observed results. This helps to ensure that the results are reliable and can be accurately interpreted.
Is the dependent variable the results?
Yes, the dependent variable is the variable which is measured.
What does test variable mean?
A Test Variable(s): The variable whose mean will be compared to the hypothesized population mean (i.e., Test Value). You may run multiple One Sample t Tests simultaneously by selecting more than one test variable. Each variable will be compared to the same Test Value. In simple terms, a variable represents a measurable attribute that changes or varies across the experiment whether comparing results between multiple groups, multiple people or even when using a single person in an experiment conducted over time.
How is the independent variable and the dependent variable related?
The independent variable is that which the investigator changes, which results in the dependant variable which you then measure.
What is changed in one variable at a time?
When only one variable is changed at a time in an experiment or study, it allows researchers to isolate the effects of that specific variable on the outcome. This method helps in understanding how individual variables impact the results and avoids confusion from multiple variables interacting simultaneously.
Factor in an experiment that results from or depends on changes to the independent variable?
In an experiment, a factor that results from changes to the independent variable is the dependent variable. The dependent variable is what researchers measure and observe to determine the effects of manipulating the independent variable. It is the outcome or response that is influenced by the changes in the independent variable.
How do you determine if a function is linear?
A function is linear if it is of the form f(x) = mx + c where m and c are constants and a is not zero.The function implies that an increase of one unit in the input variable, x, always results in an increase of m units in the output.
What text results in variable space?
Meant to say variable white space
What is the term when a variable unaccounted for in an experiment effects the results in experimental psychology?
confounding variable
