Shulou(Shulou.com)06/02 Report--

This article will explain in detail how to initialize arrays in C language. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.

What is an array?

The value is an ordered, continuous set of storage of the same data type.

Int main (void)

{

Int a = 0

In b = 20

Int c = 50

When int d = 78; / / when allocating memory, abcd4 variables are not necessarily sequential.

}

/ / define an array. Define 10 arrays of the same type, which are sequentially stored.

Int arr [10] = {2, 4, 4, 6, 8, 5, 3, 1, 9, 7, 10]

/ / printf ("arr [0] =% d\ n", arr [0]); / / fetch the first element of the array

Printf ("& arr [0] =% p\ n", & arr [0]); / / take the first element of the array, memory address

/ / printf ("& arr [0] =% x\ n", & arr [0]); / / memory addresses are represented by hexadecimal numbers

/ / printf ("& arr [0] =% # x\ n", & arr [0])

Printf ("& arr [1] =% p\ n", & arr [1])

Printf ("& arr [2] =% p\ n", & arr [2])

Return 0

Basic characteristics

① individual elements, continuous storage

The ② array is named address, which is the address of the first element of the array

Arr = & arr [0]

Printf ("arr =% p\ n", arr); / / print array name

Printf ("& arr [0] =% p\ n", & arr [0]); / / print the address of the first element of the array

③ calculates the total size of the array?

Printf ("size of array:% u\ n", sizeof (arr))

④ calculates the size of each element of the array?

Printf ("size of array elements:% u\ n", sizeof (arr [0]))

⑤ calculates the number of elements in the array?

Printf ("number of array elements:% u\ n", sizeof (arr) / sizeof (arr [0]))

The subscript of the first element of the ⑥ array: 0

The subscript of the last element of the ⑦ array?

Printf ("Last subscript of the array:% u\ n", sizeof (arr) / sizeof (arr [0]-1))

Array initialization

/ / initialization method 1

Int arr [5] = {1,2,3,4,5,6}

/ / initialization method 2

Int main (void)

{

Int arr [5] = {3,7}; / / remaining uninitialized elements. Default is 0.

For (int I = 0; I < 5; iTunes +)

{

Printf ("% d\ n", arr [I])

}

Return 0

}

/ / initialization method 3

Int arr [5] = {0}; / / initialize a data with all elements of zero

Initialization method 4

Int arr [5] = {1, 2, 3, 4, 7, 9, 9, 10, 13, 16}

/ / the editor automatically sums the number of array elements

/ / initialization method 5

Int arr [5] = {0}; / / defines an array with only one element with a value of 0

/ / initialization method 6

Int arr [10]; / / declares an array of 10 elements

Arr [0] = 5

Arr [1] = 6

Arr [2] = 7

Programming problem, how to use array elements in reverse order

Bubbling sort

5 2 3 1 6 8 9 / n, more than nMel 1 line

2 3 1 5 6 8 / / outer control line

2 1 356 for (iTun0; I < 7; iTunes +)

1 2 3 5 for

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.