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This article mainly explains "C language array introduction example analysis", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Now let the editor to take you to learn the "C language array entry case analysis" bar!

1. One-dimensional array

Definition of an array: an array is a collection of elements of the same type

a. Creation of one-dimensional array

The array is created in the following format: array type array name [constant expression]

About creating error-prone points for arrays:

b. Initialization of one-dimensional array

Similar to the process of initializing an integer variable:

Int asides 2; int bundles 5; int clocks 66

About the error prone points of array initialization:

The end flag of the string is\ 0

Special note: array length and string length are not the same thing

# include # include int main () {int arr1 [3] = {1Magazine 3}; / the array has three elements: 1, 2, 3 int arr2 [4] = {1Power2, 3}; / / the array has four elements, 1, 2, 3, 0, int arr3 [4] = {0}; / / the array has 0, 0, 0, 0, 4 elements char ch5 [5] = "dat" / / the array has five elements char ch6 [] = "dat"; / / the array has four elements: d, a, t,\ 0, char arr6 [] = "abc"; / / the array has four elements: a, b, c,\ 0. The length of the array is 3, and the string length is 3 char arr7. / / the array has three elements a, b, c, the length of the array is 3, and the string length is random printf ("% d\ n", strlen (arr6)); / / 3 printf ("% d\ n", strlen (arr7)); / / random value printf ("% s\ n", arr6); / / get abc printf ("% s\ n", arr7); / / abc messy return 0 } c. The use of one-dimensional array

The [] subscript reference operator is used to access an element in the array. The array is accessed using the subscript, which starts at 0.

Calculate the size of the array as follows:

# include int main () {int arr [10] = {0}; int sz = sizeof (arr) / sizeof (arr [0]); printf ("then the array size is% d\ n", sz); return 0;} d. Storage of one-dimensional array in memory

One-dimensional array is continuously stored in memory

The storage address of the array changes from low to high. Look at the code:

two。 Two-dimensional array

The one-dimensional team leader goes like this:

Int arr [10] = {0}

The two-dimensional team leader goes like this:

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

a. Creation of two-dimensional array

Int arr1 [3] [4]; three rows and four columns

Char arr2 [4] [4]; four rows and four columns

Float arr3 [3] [6]; three rows and six columns

Special note: in a two-dimensional array, rows can be omitted, such as:

Int arr [] [4]

b. Initialization of two-dimensional array

Int arr1 [3] [4] = {1pm, 2pm, 3pm, 4pm 5}

First line: 1 2 3 4

Second line: 5000

Third line: 0 000 0

Char arr2 [4] [4] = {{1 ~ 2}, {3 ~ 4}}

First line: 1 200 0

Second line: 3 400 0

Third line: 0 000 0

Line 4: 0 000 0

Float arr3 [3] [6] = {{1 ~ 2}, {3 ~ 4}, {5 ~ 6 ~ 0 ~ 2}

First line: 1 2000 0 0

Second line: 3 400 000 0 0

Line 3: 5 60 0 2 0 0

Special note: the parts that are not fully initialized are all 0

c. Use of two-dimensional arrays

Like one-dimensional array, the use of two-dimensional array is also realized by subscript, the order of rows and columns, and the order of subscript can not be wrong.

d. Storage of two-dimensional array in memory

Through the following figure, we find that:

Two-dimensional arrays are also stored continuously in memory.

The storage address of the array also changes from low to high.

3. Array out of bounds

The subscript of an array is limited

Stipulate that the array subscript starts at 0, and the last element subscript is nmur1.

Look at the following code:

If iSubscript 3; there are 0 1 2 3 4 subscripts, there are 4 elements

If there is 0 1 2 3 4, then there are five elements in five subscripts.

4. Array as function parameter

Here's a bubble function: sort the elements, for example.

This code can only be debugged to get an effect.

# include void bubble_sort (int arr [], int sz) {int I = 0; for (I = 0; I

Arr [I]) {int tmp = arr [j]; arr [j] = arr [j + 1]; arr [j + 1] = tmp;} int main () {int arr [] = {1 sizeof (arr) / sizeof (arr [0]); bubble_sort (arr, sz) Return 0;} 5. Array name

The array name is the address of the first element (with two exceptions)

1.sizeof (array name) calculates the size of the array

2. & the name of the array, which takes out the address of the array

At this point, I believe that everyone has a deeper understanding of the "C language array entry example analysis", might as well come to the actual operation! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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