What is computer main

Computer main means main function. In programming languages ​​​​such as C, C, and Java, the main function is the entry point of the program. When running a program, the operating system will first call the main function, which can define the program's Logic and algorithms, and interact with users, it is the starting point of program execution and the control center of the program.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Computer main refers to the main function main in programming.

In programming languages ​​such as C, C, and Java, the main function is the entry point of the program. When we run a program, the operating system will first call the main function. It is the starting point for program execution and the control center of the program.

The main function is the main execution body of the program, which contains the main logic and algorithm of the program. In the main function, we can define variables, call functions, execute loops, branch judgments and other operations. It is responsible for implementing the program's functionality and interacting with the user.

In C language, the prototype of the main function is usually:

int main(void)
{
    // 程序逻辑
    return 0;
}

In this example, the return type of the main function is int, which means it will return an integer value. A return value of 0 usually indicates successful program execution, while other non-zero values ​​indicate a program error. The parameter list (void) of the main function means that it does not receive any parameters, which means that we cannot pass any value to the main function.

The prototype of the main function is slightly different in C and Java. In C, the main function can have two forms:

int main()
{
    // 程序逻辑
    return 0;
}

or

int main(int argc, char *argv[])
{
    // 程序逻辑
    return 0;
}

In these two forms, the argc and argv parameters are used to receive command line parameters. argc represents the number of parameters, and argv is an array of pointers pointing to parameter strings. This allows us to pass parameters to the program on the command line so that different logic can be executed based on different parameters.

In Java, the prototype of the main function is as follows:

public static void main(String[] args)
{
    // 程序逻辑
}

In this example, the parameter args of the main function is a string array used to receive command line parameters. Unlike C and C, Java's main function has no return value.

In short, computer main refers to the entry function of the program, which is responsible for the execution and control of the program. Through the main function, we can define the logic and algorithm of the program and interact with the user. Whether it is C, C or Java, the main function is a very important concept in programming. As a programmer, we need to fully understand and master the usage and characteristics of the main function in order to write efficient and reliable programs.

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