How does the main function in C language call other functions?

In C language, the main function typically uses function calls to invoke other functions. The general syntax for a function call is:

函数名(参数列表);

In it, the function name is the name of the function to be called, and the parameter list is the parameters to be passed to the function. The main function can call other functions to perform specific tasks.

Here is a simple example demonstrating how the main function calls other functions.

#include <stdio.h>

// 声明一个函数，用于打印一条消息
void print_message() {
    printf("Hello, World!\n");
}

// 主函数
int main() {
    printf("This is the main function.\n");

    // 调用print_message函数
    print_message();

    printf("Back to the main function.\n");

    return 0;
}

In the above example, the main function calls a function called print_message to print a message. Within the main function, the function is called using print_message(). After calling the function, the program will execute the code defined in the print_message function, and then return to the main function to continue executing the remaining code.

Please note that in order to call other functions, you need to define these functions either before or after the main function. This is because the compiler needs to know the declaration or definition of the function before calling it.