The function to be called needs to be returned to the outside by return. For example:
1);
}
})();
ta()； //Execute ta and the message 1 pops up.
Supplement:
Closure means that one function can access variables within the scope of another function. The most common way to create a closure is to create another function in one function and access its local variables through another function. This kind of writing is the end of writing. If the function inside the closure is not in return mode, it cannot be obtained from the outside and cannot be called.
How to call the function in main function in C language?
In C language, the general form of function call is: function name (argument table) has no argument table when calling nonparametric function. The parameters in the actual parameter table can be constants, variables or other structural types of data and expressions. Parameters are separated by commas.
# includestdio.h & gt
intfun(intx，inty)； //Function declaration. If the function is written before the called place, there is no need to declare it.
voidmain()
{
inta= 1，b=2，c；
c=fun(a，b)； //Call the function, and call the user-defined function fun, where a and b are the actual parameters and are passed to the input values of the called function.
}
//User-defined function fun
Intfun(intx, inty)// function header
The language in {/{} is a function body.
returnx & gty？ x:y； //Returns the larger of x and y.
}
How to reference and execute the Function defined by function in EXCEL?
Quote and execute the Function defined by function in excel: alt+F 1 1 Open VBE, insert a module, and then put the function defined by yourself into the newly inserted module for use in EXCEL. Use the same method as EXCEL built-in functions. A general term for functions and subroutines. In some programming languages, it refers to a subroutine or statement with a return value. It acts as a keyword in some programming languages. In the field of mathematics, a function is a relationship that makes each element in one set correspond to the only element in another (possibly the same) set. -Avariable sorelatedtonotherthaforeachvalueassumdbyonethereisavaluedeterminatedfortheother。 Independent variable, a variable whose function is associated with another quantity. Any value in this quantity can find a corresponding fixed value in another quantity. -a set of corresponding relations between two sets, between two sets, between two sets and between two sets. The rule of one-to-one correspondence between two groups of elements of a function, in which each element in the first group has only a unique corresponding quantity in the second group. The concept of function is the most basic for every branch of mathematics and quantity. Definition of ~ ‖ function: Let x and y be two variables, and D be a subset of real number set. If for every value x in D, the variable Y has a certain value corresponding to it according to certain rules, it is called a function of the variable X, and it is recorded as y=f(x). The number set d is called the domain of function, which is determined by the corresponding rules of function or the requirements of practical problems. The integer value of the corresponding function is called the range of the function, and the corresponding rule and the defined range are two elements of the function. A correspondence in functional mathematics is the correspondence from nonempty set A to real number set B. Simply put, A changes with B, and A is a function of B. To be precise, let X be nonempty set, Y be nonempty number set, and F be the corresponding rule. If for each X in X, there is only one element Y corresponding to it according to the corresponding rule F, then the corresponding rule F is called a function on X, denoted as y=f(x), and X is the domain of the function F (x), and the set {y | y = If the concept of mapping is defined first, the function can be simply defined as: the mapping defined between non-empty number sets is called a function. Example 1:y=sinxX=, Y=, and a functional relationship is given. Of course, changing y to Y 1=(a, b) and changing ab to any real number is still a functional relationship. The corresponding relationship between its depth y and the distance x from the shore point o to the measurement point is a curve, which represents a function with a definition domain. The above three examples show three representations of functions: formula method, table method and image method. Generally speaking, in a changing process, if there are two variables X and Y, and Y has a corresponding value for each certain value u=f(x, then we say that X is an independent variable and Y is a function of X. If Y=B when X=A, then B is called the function value when the independent variable value is A, a compound function has three variables, Y is a function of U, and y=ψ(u A chain can often be formed: Y forms a function of X through the intermediate variable u: x→u→y, depending on the domain: Let ψ be the range of U.F. When U*íU, F and ψ form a composite function, for example, y=lgsinx, x∈(0, π). At this time, sinx & gt0 and lgsinx make sense. However, if x∈(-π, 0) is specified, sinx0 and lgsinx are meaningless at this time, so they cannot be composite functions.
What are the ways to call a function?
1. Remember that some functions can be entered directly, and formulas similar to those you entered will automatically appear in the table for you to choose from.
2. If you don't remember the formula, you can choose the formula that suits your operation under the formula tab in the table to apply it.
3. It is suggested that after you know the operation you need, you should first find the formula of echo operation through some methods, and then perform table operation, which will reduce unnecessary time.
What is a function call statement? Like what?
Methods and steps of calling functions in C language;
Tools/materials: C language
1. First, you need to enter the function you want to call.
2. Then, after entering a bracket, you can observe its parameters.
3. Then enter the parameter values in the corresponding parameters.
4. Then, a warning will appear in the system.
5. Then you need to call its corresponding header file.
6. Finally, compile again and find that there are no warnings or errors.
How to use the r function?
A function is a set of statements that are combined to perform a specific task. R has a large number of built-in functions, but users can also create their own functions. In R, a function is an object, so the R interpreter can pass control to the function to pass parameters to the function to complete the operation. This function in turn performs its task and returns control to the interpreter and any results that can be stored in other objects.
In R language, we use keyword functions to create functions. Let's look at the basic syntax of R function definition:
function _ name-function(arg _ 1，arg_2...){
Functional body
}
There are many different parts in the function. Let's see:
Function Name-This is the actual name of the function. It is stored in the R environment with the R name as the object.
Parameter-The parameter is a placeholder. When the function is called, the value is passed to the parameter. Parameters are optional; That is, the function may not contain parameters. Parameters can also have default values.
Function body-The function body contains a set of statements that define the function.
Return Value-The return value of a function is the last evaluated expression in the function body.
R has many built-in functions that can be called directly in the program without definition. We can also create and use our own functions, which we call custom functions. Here, let's take a look at the built-in functions first.
Simple examples of built-in functions are: seq (), mean (), max (), sum(x) and paste (...). They can be directly called in programs written by users, and more can refer to widely used R functions. See example:
The output result is:
We try to create user-defined functions in R to realize the functions that users want. When creating these user-defined functions, they can be used like built-in functions. Let's look at examples of creating and using functions:
The output result is:
Let's look at an example of a function with no parameters:
The output result is:
Then try to call a function with parameter values (by location and name). The parameters of a function call can be provided in the order defined in the function or in a different order, and only the names assigned to the parameters are required. Examples are as follows:
The output result is:
And calling functions with default parameters.
We can define the values of parameters in the function definition, call the functions to get the default results without providing any parameters, or call these functions to get non-default reference values by providing new parameter values. See example:
The output result is:
Finally, let's look at the lazy computing function. The parameters of the function are evaluated/evaluated lazily, that is, they are evaluated/evaluated only when the function body needs them. Examples are as follows:
The output result is:
As shown above, the value of parameter b is not provided only in print (b). Therefore, we should pay attention to the occurrence of such problems when writing programs, and it is best to give parameter b a default value.