What is the only function in C language?

The only function in C language is the main function, which is called the main function. In C language, the program always starts execution from the main function, and always ends at the return statement or the end of the main function by default.

The only function in C language is the main function, which is the entry and exit of the program.

(Recommended learning: C language tutorial)

Related introduction:

In C language, the program always starts from the main function Execution, and always ends at the return statement or the end of the main function by default.

The biggest feature of C programs is that all programs are assembled using functions. main() is called the main function and is the entry point for all program operations. The remaining functions are divided into parameterized and parameterless, and are called by the main() function or other general functions. If a parameterized function is called, the parameters are passed during the call.

Code example:

int main(void)//整数类型 主函数(无类型)
{
...
y1=f1(x1,x2);//赋值过程
...
}
 
f1(int a,int b)//f1(整数类型 a,整数类型 b)
{
Y2=f2(x3,x4);//赋值过程
}
f2(int m,int n)//f2(整数类型 m,整数类型 n)
{
}

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