#include#include /**************************************** * 函数指针结构体 ***************************************/typedef struct _OP{ float (*p_add)(float, float); float (*p_sub)(float, float); float (*p_mul)(float, float); float (*p_div)(float, float);} OP;/**************************************** * 加减乘除函数 ***************************************/float ADD(float a, float b){ return a + b;}float SUB(float a, float b){ return a - b;}float MUL(float a, float b){ return a * b;}float DIV(float a, float b){ return a / b;}/**************************************** * 初始化函数指针 ***************************************/void init_op(OP *op){ op->p_add = ADD; op->p_sub = SUB; op->p_mul = &MUL; op->p_div = ÷}/**************************************** * 库函数 ***************************************/float add_sub_mul_div(float a, float b, float (*op_func)(float, float)){ return (*op_func)(a, b);}int main(int argc, char *argv[]){ OP *op = (OP *)malloc(sizeof(OP)); init_op(op); /* 直接使用函数指针调用函数 */ printf("ADD = %f, SUB = %f, MUL = %f, DIV = %f\n", (op->p_add)(1.3, 2.2), (*op->p_sub)(1.3, 2.2), (op->p_mul)(1.3, 2.2), (*op->p_div)(1.3, 2.2)); /* 调用回调函数 */ printf("ADD = %f, SUB = %f, MUL = %f, DIV = %f\n", add_sub_mul_div(1.3, 2.2, ADD), add_sub_mul_div(1.3, 2.2, SUB), add_sub_mul_div(1.3, 2.2, MUL), add_sub_mul_div(1.3, 2.2, DIV)); return 0;}