1. Character pointer
1. Two ways to write character pointers
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;
}
You can use address symbols or double quotes and characters. Here abcdef is a constant string and cannot be changed.
Two, pointer array
Simply put, it is an array of pointers.
int main()
{
int *arr[10];
char*ch[20];
return 0;
}
Three, array pointer
Essentially a pointer
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;
}
Application of array pointer
eg: printing two-dimensional array
1. Array method
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. Array pointer method
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;
}
Analogous to our one-dimensional array parameter transfer, the first address is passed, and it is passed with a one-dimensional pointer or array to receive it, and a two-digit array is passed as the parameter. The address passed is the address of the first row, which is received with an array pointer.
