里面的函数指针操作 [英] Pointer manipulation inside function

问题描述

让我们说我有指向内存的指针

Let's say I have a pointer pointing to memory

0x10000000

我要添加到它，所以它遍历掉电记忆，例如：

I want to add to it so it traverses down memory, for example:

0x10000000 + 5 = 0x10000005

我将如何做到这一点的一个函数里？我将如何传递的指针指向，并在函数中添加5到它，那么该函数完成后的地址，我可以使用这个值？

How would I do this inside a function? How would I pass in the address that the pointer points to, and inside the function add 5 to it, then after the function's complete, I can use that value?

推荐答案

基本上，就像每个人都如说你要通过引用传递指针（这是一个指向指针的指针又名双指针）的其他功能。

Basically, like what everyone else as said you have to pass the pointer by reference(that is a pointer to a pointer aka double pointer) to the function.

#include<stdio.h>

void IncrementAddress(void **addr)
{
   int offset=5;//give what ever value you want

   *addr = *addr + offset;
    printf("%d\n",*addr);
}  

int main()
{
  char x;// or any other data type like int x or float x etc.
  void *ptr=NULL;
  ptr = &x;

  printf("%d\n",ptr);
  IncrementAddress(&ptr);
  printf("%d\n",ptr);

  return 0;
}

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