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2. Multi dimensional array
2.1
Two dimensional array
Two dimensional array is nothing but array of array.
syntax of array:
data_type array_name[num_of_rows][num_of_column];
S.no
Array declaration
Array initialization
Accessing array
1
Syntax:
data_type arr_name
[num_of_rows][num_of_column];
data_type arr_name[2][2]
=
{{0,0},{0,1},{1,0},{1,1}};
arr_name[index];
int arr[2][2] = {1,2, 3, 4};
arr [0] [0] = 1;
arr [0] ]1] = 2;
arr [1][0] = 3;
arr [1] [1] = 4;
2
Example:
int arr[2][2];
Example program for two dimensional array in C:
Source Code to initialize and access two-dimensional array:
#include<stdio.h>
int main()
{
int i,j;
// declaring and Initializing array
int arr[2][2] = {10,20,30,40};
/* Above array can be initialized as below also
arr[0][0] = 10; // Initializing array
arr[0][1] = 20;
arr[1][0] = 30;
arr[1][1] = 40;
*/
for (i=0;i<2;i++)
{
for (j=0;j<2;j++)
{
// Accessing variables
printf("value of arr[%d] [%d] : %d\n",i,j,arr[i][j]);
}
}
}
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Output:
value of arr[0] [0] is 10
value of arr[0] [1] is 20
value of arr[1] [0] is 30
value of arr[1] [1] is 40
Source code to find sum of two matrix of order 2*2 using multidimensional arrays where, elements of matrix entered by user.
#include <stdio.h>
int main(){
float a[2][2], b[2][2], c[2][2];
int i,j;
printf("Enter the elements of 1st matrix\n");
/* Reading two dimensional Array with the help of two for loop. If there was an array of 'n' dimension, 'n'
numbers of loops are needed for inserting data to array.*/
for(i=0;i<2;++i)
for(j=0;j<2;++j){
printf("Enter a%d%d: ",i+1,j+1);
scanf("%f",&a[i][j]);
}
printf("Enter the elements of 2nd matrix\n");
for(i=0;i<2;++i)
for(j=0;j<2;++j){
printf("Enter b%d%d: ",i+1,j+1);
scanf("%f",&b[i][j]);
}
for(i=0;i<2;++i)
for(j=0;j<2;++j){
/* Writing the elements of multidimensional array using loop. */
c[i][j]=a[i][j]+b[i][j]; /* Sum of corresponding elements of two arrays. */
}
printf("Sum Of Matrix:\n");
for(i=0;i<2;++i)
for(j=0;j<2;++j){
printf("%.1f\t",c[i][j]);
if(j==1)
/* To display matrix sum in order. */
printf("\n");
}
return 0;
}
Output
Enter
Enter
Enter
Enter
Enter
Enter
Enter
Enter
Enter
Enter
the elements of 1st matrix
a11: 2;
a12: 0.5;
a21: -1.1;
a22: 2;
the elements of 2nd matrix
b11: 0.2;
b12: 0;
b21: 0.23;
b22: 23;
Sum Of Matrix:
2.2
0.5
-0.9
25.0
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