I m new to learning C and I d like to ask you a question

Not all functions have a return value.

When no value is returned.

The function type is defined as void

Like what. void output()

printf("welcome!");

It doesn't have a return value.

Sinusoidal function sin(x).

It is a mathematical function defined in the system header file.

The execution looks something like this, calling it, figuring out the result, and returning a value.

It's the same as the function you define yourself.

The same thing.

If you count void as a return value, it's right that all functions have a return value.

If the return value is void, we generally don't count it as having a return value, and we call this kind of function a procedure.

If you've studied other languages like basic and pascal, not every language has the function process part of C.

No, functions are in a broad sense, and this is a method, and execution is understood here as calling a function to complete a certain function.

But some functions don't have a return value, such as empty type void

Run: This is a necessary part of Windows, and we can simply understand it as a component that an application can quickly call. Functions have polymorphism

You may be right, the return value of a function does not have to be assigned

No, for example, the printf function is the output and does not return the value of the function.

The difficulty of learning varies from person to person. For ordinary people, C++ is very difficult to learn by itself, because C++ needs to learn a lot of things and it is difficult, if you don't master the method of learning C++, you may only be able to get started in 1-2 years, but if you master the method of learning C++, you can learn C++ in half a year, but the average person has not been exposed to systematic method teaching, so it will be slow to master.

Extended reading: The word C++ is usually pronounced as "C plus plus" in Chinese mainland programmer circles, while Western programmers usually pronounce it as "C plus plus", "cpp". It is a very widely used computer programming language.

C++ is a general-purpose programming language that supports multiple programming paradigms with static data type checking.

It supports a variety of programming styles such as procedural programming, data abstraction, object-oriented programming, and generic programming. The latest official standard, C++, was published on August 18, 2014. It has a wide range of programming fields, often used in system development, engine development and other application fields, and is one of the most powerful programming languages used by the majority of programmers so far

Classes, packages, overloads, and more!

The difficulty of learning varies from person to person, as the so-called will not be difficult for those who know, but those who are difficult will not.

<><c. A summary of the basic knowledge of the language

1. C language starter program hello world

Note: In the latest C standard, the type before the main function is int instead of void

2. The specific structure of the C language

To put it simply, a C program is made up of a number of header files and functions.

include is a preprocessing command that tells the C compilation system that it needs to do some preprocessing before compiling a C program.

A function is a small unit that implements logic.

3. The essential main function

A C program has one and only one main function, the main function.

The C program is the ** in the execution of the main function, and it can also be said that this main function is the only entry point in the C language.

The int before main is the type of the main function.

printf() is the format output function, so remember that its function is to output the specified information on the screen.

return is the return value of the function, and the returned value is different depending on the function type.

ln is a line break in the Convert Fiber Talk Answer Character. (Note: The C program must be executed from the main function).

4. Good habit of writing

A description or a statement occupies a line, for example, the end of an executable statement containing a header file requires that the statement in the body of the wrapping function should be significantly indented, usually by pressing the tab key as an indentation.

Parentheses should be written in pairs, and if they need to be deleted, they should also be deleted in pairs, and when an executable statement ends, there needs to be a semicolon at the end, and all the symbols in ** are English half-width symbols.

5. Annotate the program one by one

Comments are written for programmers, not computers.

There are two ways to annotate the C language:

6. Basic operators of C language

Note in the division operation:

If both numbers are integers, then the result is also an integer, and the decimal part is omitted, e.g. 8 3 = 2 and one of the two numbers is a decimal, the result is a decimal, e.g. =

Note in the remainder operation: This operation is only suitable for remainder operation with two integers, such as: 10%3=1

The calculated symbols depend on the modulus symbols, e.g. vertical (-10)%3 = -1 and 10%(-3) = 1

You can't waste free resources for applying for professional courses, or skip classes.

The hardest part of the C language is the pointer, as long as you figure it out and study it carefully. I believe that as long as you take the time, you can learn well.

C is a process-oriented language. From data types, basic expressions, to conditional statements, loop statements, and then learn functions, plus some simple array knowledge, practice each knowledge point several times, at this time, don't be greedy, you must understand the principle of things thoroughly.