Where to start the execution of C language program?

Where to start executing C language program?

In a C language program, the starting point of execution is usually the main function. The main function is the entry function of the C program and the starting point of program execution. Its definition is similar to other functions, but has special functionality. When executing the program, the program will start executing from the main function, and then execute the statements in the main function in a certain order.

Programs in C language usually start execution from the main function. This is because the compiler will find the main function when compiling the program and use it as the starting point of the program. During program execution, the compiler will execute the code in the program line by line in the order of statements in the main function until the program ends or a return statement is encountered.

The definition of main function is usually as follows:

int main()
{
    // 程序执行的主体部分
    return 0;
}

In the definition of main function, int represents the type of function return value, which is generally agreed to be an integer type. Parameters can be omitted or included in the parentheses after the main function, but it is agreed in the C language standard that the main function does not accept any parameters. Inside the braces is the main part of the program, which is the specific statements that need to be executed when the program is executed. The return 0 statement indicates that the program execution was successful.

In addition to the main function, C language also provides some other special functions, such as startup functions, initialization functions, etc. These functions play an important role before or after the program starts executing. For example, when a program starts, the compiler will look for a startup function and use the startup function to initialize the running environment of the program. After the main function is executed, the compiler will look for the processing function at the end of the program to perform cleanup work.

In short, where to start executing a C language program, the answer is to start from the main function. The main function is the entry function of the C program and the starting point of program execution. By defining the main function and writing the main part of the program in it, we can control the execution logic and flow of the program.

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