Multidimensional array in C Language

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This series of articles focuses on some vague issues in the C language syntax and some common language skills.

The first statement is: I will give the explanation of C language syntax and skills in the form of source code. These are the basics of C language, practical and important, of course, for the C language veteran, these are all class axe. however, I still think it is helpful for you to improve your language skills, no matter you are a novice or veteran.

In addition, most of the articles are extracted from some typical C language books, but there is no shortage of my feelings. I believe there will be more wonderful things as I study deeply.

Recommended books: <The C programming language >,< pointers on C >,< Expert C Programming >,< C traps and pitfalls>

The article is provided in the form of code reference comments, and the running results are compared.

/* =====================================================
This program is a test program used for learning.
This section describes some learning mistakes in C language.
Detailed explanation of knowledge
======================================================= */
# Include <stdio. h>
# Include <stdlib. h>

Void main ()
{
/* ===================================================== ============
Topic: multi-dimensional array in C Language
Content: The dimension-1 method for defining and referencing multi-dimensional arrays in C language is to use arrays.
Array (that is, the array and multi-dimensional array are the same concept here,
This is not the case in Pascal). In C, arrays are actually considered as a vector.
(Vector) is a one-dimensional array of an object (the array element can be a one-dimensional array ).
And others ).
========================================================== ============= */
/* 1. Break down multi-dimensional arrays and locate array elements in multi-dimensional arrays */
Int data [2] [3] [4] = {1, 2, 3}, {5, 6, 7, 8}, {9, 10, 11, 12 },{ 13, 14, 15, 16 },
{17,18, 19,20 },{ 22 }}};
Printf ("1st test values: % d/N", data [1] [2] [3]); // No error is reported if the array in the test is out of bounds.

// P is a pointer to a two-dimensional array. This must ensure that the dimension behind P is the same as that behind data.
INT (* P) [3] [4] = data;
Printf ("2nd test values: % d/N", P [1] [2] [3]);

// R is a pointer to a one-dimensional array. It can point to the first or second one-dimensional array in data (regard the data element as a one-dimensional array)
INT (* r) [4] = data [1];
Printf ("3rd test values: % d/N", R [1] [2]);

// T is an int pointer that points to the first element of the third dimension in data (the third dimension is arbitrary)
Int * t = data [0] [0];
Printf ("4th test values: % d/N", t [3]);

// The increment of the array dimensions pointed to by the pointer above varies greatly.
Printf ("5th test values: % x/N", R );
R ++;
Printf ("6th test values: % x/N", R );
Printf ("7th test values: % x/N", t );
T ++;
Printf ("8th test values: % x/N", t );

/* 2. initialize a multi-dimensional array */
// An example of how to initialize a multi-dimensional array is mentioned above.
Int data1 [] [3] = {1, 2, 3}, {4, 5}; // If the dimension is greater than the number of initial values, the value is converted to 0.
Printf ("1st test values: % d/N", data1 [1] [2]);

/* 3. Create a two-dimensional string array */
Char fruit [] [9] = {"apple", // method 1
"Orange ",
"EGE ",
"Banana "};
Printf ("1st test values: % s/n", fruit [1]);

Char * anima [] = {"tiger", // method 2
"Lion ",
"Chick ",
"Elephont "};

Printf ("1st test values: % s/n", anima [1]);
}

The running result is as follows:

The 1st test values are as follows: 24

The 2nd test values are as follows: 24

3rd test values: 19

The 4th test values are as follows: 4

The 5th test values are: 12ff50.

The 6th test values are: 12ff60.

The 7th test values are: 12ff20

The 8th test values are: 12ff24

The 1st test values are: 0.

The 1st test values are orange.

The 1st test values are: Lion