Easy tutorial for C / C ++ - Arrays 7 (The name of
the two-dimensional array 2)
-
The name of the two-dimensional array is a two-dimensional pointer, and you can
access the value stored in the address by pasting '*' twice.
- In the previous,
we only approached the first of each row. Let's look at finding the element
values of the entire array.
How
to access specific elements.
'Array
name' ['row'] ['column']
Address
value
: * ('array name' + 'row number') + 'column
number'
The value assigned to the address
: * (* ('array name' + 'row number') +
'column number')
-
Let's look at an example.
Example Code
#include
<iostream>
#include
<iomanip>
using
namespace std;
int
main() {
int a[2][3] = { {0,1,2},
{3,4,5}};
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << a[i][j] ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << &a[i][j] ;
}
cout << endl;
}
cout << endl;
cout << " The name of the two-dimensional array 2"
<< endl;
cout << endl;
cout << "Addresses of the 2-D
array" << endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << *(a + i) + j ;
}
cout << endl;
}
cout << endl;
cout << "Values of the 2-D
array " << endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << *(*(a + i) + j) ;
}
cout << endl;
}
cout << endl;
return 0;
}
-
The two-dimensional array a[2][3] was declared and initial values were given.
We used the indexes of rows and columns to print the values and addresses
stored in the array.
-
Let's print the address using the name of the array. I have written the
sentence "* (a + i) + j" in the for loop. Where 'i' and 'j' are the
index representing the row and the column, respectively.
-
The whole sentence "* (a + i) + j" is enclosed in parentheses "*
()" to get the value stored in the address. "* (* (a + i) + j)"
results
:
0 1 2
3 4
5
0x7ffd4024ebe0 0x7ffd4024ebe4 0x7ffd4024ebe8
0x7ffd4024ebec 0x7ffd4024ebf0 0x7ffd4024ebf4
The name of the two-dimensional array 2
Addresses
of the 2-D array
0x7ffd4024ebe0 0x7ffd4024ebe4 0x7ffd4024ebe8
0x7ffd4024ebec 0x7ffd4024ebf0 0x7ffd4024ebf4
Values
of the 2-D array
0 1 2
3 4 5
- You
can see that you can obtain the same results.
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