2 Dimensional Arrays
·
Implementing a database of information as a collection of arrays can be
inconvenient when many arrays are passed to utility functions to process the
database.
·
It would be nice to have a single data structure which can hold all the
information, and pass it all at once.
·
2-dimensional arrays provide most of this capability.
·
Like a 1D array, a 2D array is a collection of data cells, all of the
same type, which can be given a single name.
·
However, a 2D array is organized as a matrix with a number of rows and
columns.
How do we declare a 2D array?
·
Similar to the 1D array, the data type
are specified: the name, and the size of the array.
·
But the size of the array is described as the number of rows and number
of columns.
·
For example:
int a[MAX_ROWS][MAX_COLS];
·
This declares a data structure that looks like:
WAP
to Read and Write 2 by 2 Matrix.
#include<stdio.h>
void main(){
/* 2D array declaration*/
int disp[2][2];
/*Counter variables for the
loop*/
int i, j;
for(i=0; i<2; i++) {
for(j=0;j<2;j++) {
printf("Enter value
for disp[%d][%d]:", i, j);
scanf("%d",
&disp[i][j]);
}
}
//Displaying array elements
printf("Two Dimensional
array elements:\n");
for(i=0; i<2; i++) {
{
for(j=0;j<2;j++) {
printf("%d ", disp[i][j]);
}
printf("\n");
}
}
}
Output
Enter value for disp[0][0]:10
Enter value for disp[0][1]:20
Enter value for disp[1][0]:30
Enter value for disp[1][1]:40
Two Dimensional array elements:
10 20
30 40