C语言的函数指针数组
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2023-12-25 23:44:45
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...
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。