C语言 函数指针

function_return_type(*Pointer_name)(function argument list)

double  (*p2f)(double, char)

int sum (int num1, int num2)
{
    return num1+num2;
}
int main()
{

    /* The following two lines can also be written in a single
     * statement like this: void (*fun_ptr)(int) = &fun;
     */
    int (*f2p) (int, int);
    f2p = sum;
    //Calling function using function pointer
    int op1 = f2p(10, 13);

    //Calling function in normal way using function name
    int op2 = sum(10, 13);

    printf("Output1: Call using function pointer: %d",op1);
    printf("\nOutput2: Call using function name: %d", op2);

    return 0;
}

Output1: Call using function pointer: 23
Output2: Call using function name: 23

void (*fun_ptr)(int) = &fun;

void (*fun_ptr)(int) = fun;