C language--pointer advanced 2--pointer array

A pointer array is an array that stores pointers

analogy:

Character array --an array that stores characters

char arr1[10]; // 字符数组

Integer array --an array that stores integers

int arr2[10]; // 整型数组

Pointer array --stores pointers

char* arr3[10];// 存放字符指针的数组
int* arr4[10]; // 存放整型指针的数组

int main()
{
	char* arr[3] = { "abc","bcd","cde" };

	for (int i = 0; i < 3; i++)
	{
		printf("%c ", *(arr[i]));
	}
	printf("\n");

	for (int i = 0; i < 3; i++)
	{
		printf("%s\n", arr[i]);
	}

	return 0;
}

arr is an array of character pointers, and its element arr[i] points to the first element of the string. The first character can be accessed by dereferencing *(arr[i]), and arr[i] is printed in %s format, that is, the string pointed to by arr[i] is printed.

The execution result of the above program:

Simulate a two-dimensional array using an array of pointers

int main()
{
	int arr1[] = { 1,2,3,4,5 };
	int arr2[] = { 2,3,4,5,6 };
	int arr3[] = { 3,4,5,6,7 };

	int* arr[3] = { arr1,arr2,arr3 }; // 整型指针数组
	
	for (int i = 0; i < 3; i++)
	{
		for (int j = 0; j < 5; j++)
		{
			printf("%d ", arr[i][j]);// 等价*(arr[i]+j)
		}
		printf("\n");
	}

	return 0;
}

Results of the:

Continue to learn advanced pointer content, see the next article: Array Pointers