C语言的函数指针数组

C语言的函数指针数组：概念：数组元素是指针函数的数组叫做指针函数数组，通常我们也叫做转移表定义个初始化：返回类型说明符 (*函数指针数组名[])(参数列表) = {函数指针/函数名，…};。

如下： int (*fun_array[])(int,int) = {add,del,mul,p};

函数指针数组的使用如下：
函数指针数组名下标或者(*函数指针数组名)下标；
下面是给出的示例代码：

#include

int add(int a,int b); 
int sub(int a,int b); 
int mul(int a,int b); 
int p(int a,int b); 
void make_menu();


int main(int argc,char* argv[]){
    int (*fun_array [])(int,int) = {add,sub,mul,p};
    int cmd = 0;
    int result =  0;  
    int http://blog.csdn.net/qq_29924041/article/details/num1,num2;
    while(1){
        make_menu();
        printf("please select a num what you want :");
        scanf("%d",&cmd);
        if(cmd == 0){ 
            break;
        }else{
            printf("please input two num you want!\n");
            scanf("%d %d",&num1,&num2);
            result = fun_array[cmd-1](http://blog.csdn.net/qq_29924041/article/details/num1,num2);
            printf("the form_1_result you want to calculate is:%d\n",result);
            int (*fun_pointer)(int,int) = fun_array[cmd-1];
            result = fun_pointer(http://blog.csdn.net/qq_29924041/article/details/num1,num2);
            printf("the form_2_result you want to calculate is:%d\n",result);
            result = (*fun_array[cmd-1])(http://blog.csdn.net/qq_29924041/article/details/num1,num2);
            printf("the form_3_result you want to calculate is:%d\n",result);

        }
    }   
    return 0;
}

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 p(int a,int b){
    return a/b;
}




void make_menu(){
    printf("=====================\n");
    printf("1:add\n");
    printf("2:sub\n");
    printf("3:mul\n");
    printf("4:p\n");
    printf("0:quit\n");
    printf("=====================\n");
}

由上面我们可以看出来函数指针数组的三种调用方式：
int (*pointer)(int ,int ) = fun_array[i];
int result = pointer(http://blog.csdn.net/qq_29924041/article/details/num1,num2);
或者：
int result = fun_arrayi;
或者：
int result =*(fun_array[i])(http://blog.csdn.net/qq_29924041/article/details/num1,num2);
第三种形式我们是不经常会用到的，

结果：

1:add
2:sub
3:mul
4:p

0:quit

please select a num what you want :1
please input two num you want!
10 11
the form_1_result you want to calculate is:21
the form_2_result you want to calculate is:21
the form_3_result you want to calculate is:21

函数指针数组的运用的注意点：

函数的返回类型一样，并且函数的形参也是要一样 通常是在swith函数中去做这样的函数指针数组，便于简化代码。