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<>一、字符指针
1.字符指针的两种写法
int main() { char ch = 'a'; char*pc = &ch; char*p = "abcdef"; //将首字符a的地址放入p中
return 0; }
既可以用取址符号,也可以双引号加字符,这里的abcdef是一个常量字符串,是不能改的。
<>二、指针数组
简单的来说,就是存放指针的数组。
int main() { int *arr[10]; char*ch[20]; return 0; }
<>三、数组指针
本质上是指针
int main() { int a = 10; int *p = &a; char ch = 'w'; char*pc = &ch; int arr[10]
= { 0 }; int(*pa)[10] = &arr; //pa就是一个指向数组的指针 //&arr数组名是整个数组,取出的是数组的地址 return 0;
}
数组指针的应用
eg:打印二维数组
1.数组的方法
void print(int arr[3][5], int r, int c) { int i = 0; for (i = 0; i < r; i++) {
int j = 0; for (j = 0; j < c; j++) { printf("%d", arr[i][j]); printf("\n"); } }
} int main() { int arr[3][5] = { { 1, 2, 3, 4, 5, }, { 2, 3, 4, 5, 6 }, { 3, 4,
5, 6, 7 } }; printf(arr, 3, 5); return 0; }
2.数组指针的方法
void print(int (*p)[5],int r,int c) { int i = 0; for (i = 0; i < r; i++) { int
j= 0; for (j = 0; j < c; j++) { printf("%d ", *(*(p + i) + j)); } } } int main()
{ int arr[3][5] = { { 1, 2, 3, 4, 5, }, { 2, 3, 4, 5, 6 }, { 3, 4, 5, 6, 7 } };
//二维数组传参,数组名也是首元素地址,二维数组的首元素是第一行的地址 //传过去的是第一行的地址 printf(arr, 3, 5); return 0; }
类比我们一维数组传参,传的是首地址,传过去用一维的指针或者数组接收,得到二位数组传参,传过去的是第一行的地址,用数组指针接收。