Regarding the function definition, thanks, please explain the definition of the function.

The function definition consists of three parts: the return type, the function identifier, the required parameters of the function, and the function body, for example.

int example(int parameter)int a;

a=parameter;

return a;

This function requires that an integer be returned, and the value of return a must be an integer, otherwise a conversion will occur, and if it is a double, it will be truncated.

Typically, only function declarations are stored in header files.

The declaration only tells the function the entry address.

I learn pascal

The general format of a function definition is:

function name (formal parameter table): function type; ......This is the function header.

Description of local variables (e.g. var, etc.).

begin statement one;

Statement 2; Statement three;

statement n; Function name: = expression;

end;Example:

function sum(n:integer):integer;

vars,i:integer;

begins:=0;

for i:=1 to n do

s:=s+i;

sum:=s;

end;

Give you a ** and you'll know.

#include

void display()

printf("hello world!");

void main()

display();

Like above, if the custom function is written in front of the main function, it does not need to be declared.

And below: include

void display();Function declaration section.

void main()

display();

void display()

printf("hello world!");

Custom functions are written after the main function and must be declared.

A function is a small section of information that handles something.

What kind of programming or excel or math are you asking?

Function definition: Let a and b be two sets, if according to a certain correspondence rule f, for any element in set a, there is a unique element corresponding to it in set b, such correspondence is called a mapping from set a to set b, and it is denoted as f: a-->b

When sets a and b are both sets of non-empty numbers, and each element of b has a preimage, the mapping f:a-->bIt's called a function that defines domain a to domain b

The definition in junior high school textbooks is: generally, there are two variables xy, one of which changes with the change of the other variable x, and a value of x is given and there is a unique value of y corresponding to it. x is called the independent variable and y is called the dependent variable.

FunctionsIn mathematics, a function is a relation that causes each element in one set to correspond to the unique element in another (possibly identical) set.

A dependent variable is a variable that is associated with another quantity, and any value of this quantity can find a fixed value in the other quantity.

A rule that two sets of elements of a function correspond one-to-one, and each element in the first group has only a unique counterpart in the second group.

The concept of functions is fundamental to every branch of mathematics and quantification.

The terms function, mapping, correspondence, and transformation usually have the same meaning.

However, the function only represents the correspondence between numbers, and the mapping can also represent the correspondence between points, between graphs, etc. It can be said that a function is a special kind of mapping.

Summary. Functions are a special class of relationships. A function is a relationship between several variables, and it represents a one-to-many mapping, i.e., it has one or more arguments, but it has only one value.

It is a special, meaning-determined expression that, in addition to the calculated value, can also explain the relationship between its own finite part operations. Specifically, a function can be summarized as a relationship in which a number of values are called parameters, a relationship is fixed while the parameters change, and when the parameters change, the relationship and its results change accordingly.

Functions are a special class of relationships. A function is a relationship between several variables, and it represents a one-to-many mapping, i.e., it has one or more arguments, but it has only one value. It is a special expression determined by the meaning of the group, in addition to the value of the world, it can also explain the relationship of its own limited part of the operation.

Specifically, a function can be summarized as a relationship in which a number of values are called parameters, a relationship is fixed while the parameters change, and when the parameters change, or the spike relationship and its results change accordingly.

Excuse me, but please go into more detail?

Functions are a special class of relationships. A function is a relationship between several variables, and it represents a one-to-many mapping, i.e., it has one or more arguments, but it has only one value. It is a special expression determined by the meaning of the group, in addition to the value of the world, it can also explain the relationship of its own limited part of the operation.

Specifically, a function can be summarized as a relationship in which a number of values are called parameters, a relationship is fixed while the parameters change, and when the parameters change, or the spike relationship and its results change accordingly.

Why is the recommended answer so complicated, I don't understand.

In the function f(x-1), the independent variable is x, not x-1, if you find the definition domain, it is the value range of x, and finally the value range of the argument is the definition domain pair.

Classic examples. The domain of y=f(x+1) is [-2,3], so the inequality -2 x 3 is satisfiedx range.

1≤x+1≤4 ..f acts as x+1, so the domain of y=f(x) is [-1,4].

Therefore, for (2x-1) in y=f(2x-1), the value must be -1 2x-1 4 in [-1,4].

0≤2x≤5

0≤x≤5/2

That is, the domain of y=f(2x-1) is [0,5 2].