回调函数

• https://www.runoob.com/w3cnote/c-callback-function.html

#include<stdio.h>

int Callback_1();
int Callback_2();
int Callback_3();
int Handle(int (*Callback)());

int main()
{
    Handle(Callback_1);
    Handle(Callback_2);
    Handle(Callback_3);
    return 0;
}

int Handle(int (*Callback)())
{
    printf("Entering Handle Function. \n");
    Callback();
    printf("Leaving Handle Function. \n");
}

int Callback_1() // Callback Function 1
{
    printf("Hello, this is Callback_1 \n");
    return 0;
}

int Callback_2() // Callback Function 2
{
    printf("Hello, this is Callback_2 \n");
    return 0;
}

int Callback_3() // Callback Function 3
{
    printf("Hello, this is Callback_3 \n");
    return 0;
}