Easy tutorial for C / C ++ - Arrays 5 (Two dimensional
array - initial and address values)
The initial value of a two-dimensional array :
- Let's look at how to give initial values to a
two-dimensional array. Similar to a one-dimensional array, you can give initial
values the same as the number of rows and columns or less.
- Let's look at an
example.
Example Code
#include
<iostream>
#include
<iomanip>
using
namespace std;
int
main() {
int a[3][4] = {0} ;
int b[3][4] = { {0,1,2,3},
{4,5,6,7},
{8,9,10,11} };
int c[3][4] = {0,1,2,3,4,5,6,7,8,9,10,11};
cout << "2-dimensional arrays "
<< endl;
for(int i = 0; i < 3; i++){
for(int j = 0; j < 4; j++){
cout << setw(5) << "a[" << i <<
"][" << j << "]" ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 3; i++){
for(int j = 0; j < 4; j++){
cout << setw(10) << a[i][j] ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 3; i++){
for(int j = 0; j < 4; j++){
cout << setw(10) << b[i][j] ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 3; i++){
for(int j = 0; j < 4; j++){
cout << setw(10) << c[i][j] ;
}
cout << endl;
}
return 0;
}
- For a two-dimensional array 'a', we gave only one
initial value. In the case of a two-dimensional array 'b', a total of 12 values
were given as initial values using braces indicating three lines in the whole
brace. In the case of 'c', we gave a total of 12 values in a row.
- Let's compare the values stored in the two-dimensional array 'a, b, c'.
results
:
2-dimensional
arrays
a[0][0]
a[0][1] a[0][2] a[0][3]
a[1][0]
a[1][1] a[1][2] a[1][3]
a[2][0]
a[2][1] a[2][2] a[2][3]
0 0 0 0
0 0 0 0
0 0 0 0
0 1 2 3
4 5 6 7
8 9 10 11
0 1 2 3
4 5 6 7
8 9 10 11
- In the case of a two-dimensional array 'a', we gave
only one initial value, and all the remaining values are initialized to zero.
- Two-dimensional arrays 'b' and 'c' have the same result. This means that 'b'
and 'c' are the same initialization method.
The address value of a two-dimensional array :
- Let's see how the address values are stored in a two-dimensional array. Let's
look at an example to print the address of a two-dimensional array ('a [2]
[3]').
Example Code
#include
<iostream>
#include
<iomanip>
using
namespace std;
int
main() {
int arr[2][3] = { {0,1,2},
{3,4,5} };
cout << "2-dimensional array "
<< endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(10) << "arr[" << i <<
"][" << j << "]" ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << arr[i][j] ;
}
cout << endl;
}
cout << endl;
for(int i = 0; i < 2; i++){
for(int j = 0; j < 3; j++){
cout << setw(15) << &arr[i][j] ;
}
cout << endl;
}
cout << endl;
return 0;
}
results
:
2-dimensional
array
arr[0][0] arr[0][1] arr[0][2]
arr[1][0] arr[1][1] arr[1][2]
0 1 2
3 4 5
0x7fff8174d0e0 0x7fff8174d0e4 0x7fff8174d0e8
0x7fff8174d0ec 0x7fff8174d0f0 0x7fff8174d0f4
- It can
be seen that it increases by 4 bytes as integer type data. And the order
increases in order of data values 0, 1, 2, 3, 4, 5.
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