C Getting Started section fifth multidimensional array string array

#pragma Mark----------A two-dimensional array----------
int main (int argc, const char * argv[]) {
/*
1. The essence of a two-dimensional array: An array of array elements, called Arrays of array
2. Classes such as: Managing the age of 4 students in a class, storing a one-dimensional array as an array element in another array
int age[4] = {12,13,14,15};
12,13,14,15
21,22,23,24
31,32,33,34
3. To visualize a two-dimensional array, a two-dimensional array is usually written in rows and columns.
Two-dimensional arrays are often referred to as: M*n arrays, or M row n columns
M two-dimensional array contains the number of one-dimensional arrays, which is the first dimension, which indicates the line
n the number of elements in a one-dimensional array, which is the second dimension, which represents the first column
5. A two-dimensional array is often called a matrix. Matrix: A data table that is arranged horizontally.
Defining a two-dimensional array
Type array name [number of rows] [number of columns] = {value}
1. Rows and columns use constant expressions
2. The number of rows can be omitted and the number of columns cannot be saved
3. Set the initial value, using {{},{},{}}; form
4. Each line has insufficient elements and is automatically padded

1. Defines a two-dimensional array that stores 3 classes of students of the age, each class is 5 people
int Age[3][5] = {{12,13,14,15,16},{21,22,23,24,25},{31,32,33,34,35}};
2. Defines a two-dimensional array form 2, omitting the number of rows
A[][3] = {{1,2,3}{1,2,3,4,5}};
3. Define two-dimensional array form 3, not recommended, it is not easy to see the beginning and end of each line
int a[][3] = {1,2,3,4,5};
Accessing elements of a two-dimensional array
Access to a single element must specify two subscripts, subscript 1 for the row, subscript 2 for the column;
Attention to cross-border issues
printf ("%d", a[1][0]);
printf ("%d", a[1][2]);
Modifying two-dimensional array elements
A[0][1] = 6;
printf ("%d", a[0][1]);

Traversing a two-dimensional array requires two layers of loops, the first layer of the loop controls the number of rows, and the second loop controls the first few columns.
int A[2][3] = {{1,21,3},{4,5}};
for (int i = 0; i < 2; i + +)
{
for (int j = 0; J < 3; J + +)
{
printf ("%2d\t", A[i][j]); %2d is printed out with each character occupying two cells
}
printf ("\ n");
}
*/
/*
Exercise: Talking about the row and column exchange of a two-dimensional array, storing to another array
int Arr[2][3] = {{1,2,3},{4,5}};
int brr[3][2] = {0};
for (int i = 0; i < 3; i + +)
{
for (int j = 0; J < 2; J + +)
{
printf ("%d", arr[i][j]);
BRR[I][J] = Arr[j][i];
printf ("%d", brr[i][j]);

}
printf ("\ n");
}


Exercise: Define an array of 3 rows and 4 columns, find the largest element of the array, print it, and print the row and column
int A[3][4] = {{5,45,566,58},{4,15,65,456},{21,47,5,566,}};
int c = 0;
for (int i = 0; i < 3; i + +)
{
for (int j = 0; J < 4; J + +)
{
if (c < a[i][j])
{
c = A[i][j];

}
}
}
printf ("%d \ n", c);
for (int i = 0; i < 3; i + +)
{
for (int j = 0; J < 4; J + +)
{
if (c = = A[i][j])
{
printf ("Column%d, section%d \ n", i,j);
}
}
}
printf ("\n\n\n");

*/
/*
#pragma mark---------An array of strings---------
1. Character array: array element is an array of characters, one-dimensional array
2. String array: The data element is an array of strings, a two-dimensional array. The string itself is also a group of characters
Defines an array of strings, which are somewhat different when assigning values

Char name[3][30] = {"Pengqifeng", "caijingping", "Zhangdonghui"};
Access a string, array name [first-dimensional subscript]

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

Access a character array name [first-dimensional subscript] [second-dimensional subscript]
for (int i = 0; i < 3; i + +)
{
for (int j = 0; J < J + +)
{
printf ("%c", Name[i][j]);
}
printf ("\ n");
}


Exercise: Create an array of strings (content is the name of people around you) and output the length of the longest string
Char a[4][50] = {"Asdf", "GADF", "Qwerejir", "ASDFXCV"};
int c = 0;
for (int i = 0; i < 4; i + +)
{
int d = (int) strlen (a[i]);
if (C < D)
{
c = D;
}
}

printf ("%d \ n", c);


Exercise: Create a string array (content is the name of a circle of people around you), the string (in English) from the to the big sort.
Char a[3][30] = {"Lvyao", "Gaolei", "Gaojinghong"};
for (int i = 0; i < 2; i + +)
{
for (int j = 0; J < 2-i; J + +)
{

if (strcmp (A[j], a[j + 1]) > 0)//by Accii
if (strlen (A[J) < strlen (a[j + 1]))//by string length
{
Char b[30]= {0};
strcpy (b, a[j]);
strcpy (A[j], a[j + 1]);
strcpy (A[j + 1], b);
}
}
}
for (int i = 0; i < 3; i + +)
{

printf ("%s", A[i]);


}

Enter a string from the console
Character array Store string
Char a[100] = {0};
Gets reads the string from the standard input device, ends the read with a carriage return, ends with ' \ n ', and the carriage return ' \ nthe ' is discarded without remaining in the buffer.
Can be used to enter a string with spaces
Can be read indefinitely without judging the upper limit, so using gets is unsafe and can cause overflow

printf ("Please enter a string");
Gets (a); Read
printf ("%s\n", a);
scanf (%s\n,a); end reading with a space or carriage return, a space or carriage return left in the buffer
You cannot enter a string with spaces directly
scanf ("%[^\n]", argc); %[] Input Character set
[^\n] means that except for ' \ n ' characters are received, you can receive a space, which can be used to enter a string with a space.
printf ("Please enter a string");
scanf ("%[^\n]", a);
printf ("%s\n", a);
Enter a string from the console
string Arrays Store multiple strings
Char names[6][30] = {};
printf ("Please enter string: \ n");
for (int i = 0; i < 6; i + +)
{
scanf ("%s", Names[i]); Loop input string
GetChar ();

}
printf ("You input string: \ n");
for (int i = 0; i < 6; i + +)
{
printf ("%s\n", Names[i]);
}
*/
#pragma mark------Multidimensional array------
multi-dimensional array; array subscript at more than 2
Three-dimensional arrays, three-dimensional layers, rows, columns
Define a three-dimensional array type array name [layer] [row] [column]
int a[2][3][4] = [0];
Traversing a three-dimensional array requires a three-layer loop
int Ages[2][3][4] = {{{1,2,3,4},{4,5,6,7},{7,8,9,10}},{{12,13,14,15},{15,16,17,18},{21,22,23,24}}};

for (int i = 0; i < 2; i++) {
for (int j = 0; J < 3; J + +) {
for (int k = 0; k < 4; k++) {
printf ("ages[%d][%d][%d] =%d\n", i,j,k,ages[i][j][k]);
}
}
}

Multidimensional array access element, array name [subscript] [subscript] ....
Number of multidimensional array elements = number of members product
multiple arrays of memory = number of elements multiplied by the space occupied by a single element

C Getting Started section fifth multidimensional array string array