C語言學習筆記 -回調函數

#/*-------------------回調函數--------------------------*/
#include <stdio.h>
#include <stdlib.h>

typedef struct __OP{           //初始化函數指針 

	float (*P_ADD)(float ,float);
	float (*P_SUB)(float ,float);
	float (*P_MUT)(float ,float);
	float (*P_DIV)(float ,float);
	
}OP;


float ADD(float a ,float b ){    //加法
	 return a+b;	
}

float SUB(float a ,float b ){      //減法
	 return a-b;	
}

float MUT(float a ,float b ){     //乘法
	 return a*b;	
}

float DIV(float a ,float b ){      //除法
	 return a/b;	
}

void 
op_init(OP *op)   // 函數指針  指向函數的位址 
{
	op->P_ADD = ADD;
	op->P_SUB = SUB;
	op->P_MUT = MUT;
	op->P_DIV = DIV;
}


float 
ADD_SUB_MUT_DIV(float a ,float b ,float (*io_fuc)(float ,float))  //函數回調 
{	
	return (*io_fuc)(a,b);	
}

int main(){
	
	OP *op = (OP*)malloc(sizeof(OP));
	op_init(op);
	//輸出函數指針的運算
	printf("ADD = %f  SUB =%f MUT = %f  DIV = %f \n"     
															  ,op->P_ADD(1,2)
							  	  	  	  	  			        ,op->P_SUB(1,2)
			 										             ,op->P_MUT(1,2)
										   				        , op->P_DIV(1,2));
	//輸出回調函數的運算					 				   				   
	printf("ADD = %f  SUB =%f MUT = %f  DIV = %f" ,ADD_SUB_MUT_DIV(1,2,ADD)
 				  	  	  	  	  		          ,ADD_SUB_MUT_DIV(1,2,SUB)
												  ,ADD_SUB_MUT_DIV(1,2,MUT)
												  ,ADD_SUB_MUT_DIV(1,2,DIV));
}