3.14study

#include <stdio.h>


/*
int main()
{
  int a = 10;
  int* pa = &a;//pa是一级指针
  int** ppa = &pa;//ppa就是二级指针
  //...

  return 0;
}
*/

/*
int main()
{
  int a = 10;
  int b = 20;
  int c = 30;
  //int* pa = &a;
  //int* pb = &b;
  //int* pc = &c;
  int* arr[3] = { &a , &b , &c };
  int i = 0;
  for (i = 0; i < 3; i++)
  {
    printf("%d ",*(arr[i]));
  }

  return 0;
}
*/


/*  //实现数组打印及逆序排列打印
void Init(int arr[], int sz)
{
  int i = 0;
  for (i = 0; i < sz; i++)
  {
    arr[i] = 0;
  }
}

void print(int arr[], int sz)
{
  int i = 0;
  for (i = 0; i < sz; i++)
  {
    printf("%d ",arr[i]);
  }
  printf("\n");
}

void reverse(int arr[],int sz)
{
  int left = 0;
  int right = sz - 1;
  while (left < right)
  {
    int tmp = arr[left];
    arr[left] = arr[right];
    arr[right] = tmp;
    left++;
    right--;
  }
}
int main()
{
  int arr[10] = { 1,2,3,4,5,6,7,8,9,10};
  int sz = sizeof(arr) / sizeof(arr[0]);
  print(arr, sz);
  reverse(arr,sz);
  //Init(arr,sz);//把数组初始化为0
  print(arr,sz);//打印

  return 0;
}
*/