#include <stdio.h>

int Add(int x,int y);
float Sub(float x,float y);
float Mul(float x,float y);
float Exc(float x,float y);

int (*pMathAdd)(int x,int y);
float (*pMathSub)(float x,float y);
float (*pMathMul)(float x,float y);
float (*pMathExc)(float x,float y);

typedef struct __MATH
{
int (*pMathAdd)(int x,int y);
float (*pMathSub)(float x,float y);
float (*pMathMul)(float x,float y);
float (*pMathExc)(float x,float y);
}_MATH;

_MATH MATH = {
Add,Sub,Mul,Exc
};

float (*pMath[3])(float,float)={
Sub,Mul,Exc
};

void main(void)
{
printf("函数指针\n");

printf("%d\n",MATH.pMathAdd(9,3));
printf("%f\n",MATH.pMathSub(9,3));
printf("%f\n",MATH.pMathMul(9,3));
printf("%f\n",MATH.pMathExc(9,3));
printf("%f\n",(*pMath[0])(9,3));
printf("%f\n",(*pMath[1])(9,3));
printf("%f\n",(*pMath[2])(9,3));
while(1);

}

int Add(int x,int y)
{
return (x+y);
}

float Sub(float x,float y)
{
return (x-y);
}

float Mul(float x,float y)
{
return (x*y);
}

float Exc(float x,float y)
{
return (x/y);
}

快捷底层函数结构体函数调用