C语言中的函数指针

函数指针的概念:   函数指针是一个指向位于代码段的函数代码的指针。

函数指针的使用:   

#include<stdio.h>

typedef struct (*fun_t) (int,int);

fun_t pf;

int add(int a, int b)

{

return a+b;

}

int sub(int a,int b)

{

return a-b;

}

int mul(int a,int b)

{

return a*b;

}

int div(int a,int b)

{

return a/b;

}

int main()

{

int result1,result2,result3,result4;

pf = add;

result1 = pf(20,4);

printf("result1 is %d",result);

pf = sub;

result2=pf(20,4);

printf("result2 is %d",result2);

pf = mul;

result3 = pf(20,4);

printf("result3 is %d",result3);

pf = div;

result4=pf(20,4);

printf("result4 is %d",result4);

return 0;

}