Multidimensional array in C

MULTI-DIMENSIONAL
ARRAY
By Smit Parikh

Multi-Dimensional Arrays
 Multidimensional arrays are derived from the
basic or built-in data types of the C language.
 Two-dimensional arrays are understood as rows
and columns with applications including two-
dimensional tables, parallel vectors, and two-
dimensional matrices.
 Mostly Two-dimensional array are used in
Multi-dimensional array.

Arrays of Greater
DimensionOne-dimensional arrays are linear containers.
Multi-dimensional Arrays
Two-Dimensional
Three-dimensional
[0] [1] [2]
[0] [1] [2] [3]
[0]
[1]
[2]
[0]
[0]
[1]
[1]
[2]
[2]
[3]
[0] [1] [2] [3] [4]

CONTENT
 Introduction to two dimensional array
 Declaration
 Initialization
 Input and output of a 2d array
 Storage allocation

Two - Dimensional Arrays
 What is a Two-dimensional array?
B =
51, 52, 53
54, 55, 56
Algebraic notation
Col 1 Col 2 Col 3
Row 1
Row 2
Int b[2][3] = {(51, 52, 53),(54, 55, 56)};
Array type Array name
Array dimension = 2
Two rows
Three columns
First row second row
C notation

7
Indexes in 2D arrays
 Assume that the two dimensional array called val is
declared and looks like the following:
 To access the cell containing 6, we reference val[1]
[3], that is, row 1, column 3.
val Col 0 Col 1 Col 2 Col 3
Row 0 8 16 9 52
Row 1 3 15 27 6
Row 2 14 25 2 10

DECLARATION
 How to declare a multidimensional array?
int b[2][3];
the name of the array to be b
the type of the array elements to be int
the dimension to be 2 (two pairs of brackets [])
the number of elements or size to be 2*3 = 6

 How to initialize a Two-Dimensional array?
 Initialized directly in the declaration statement
 int b[2][3] = {51, 52, 53, 54, 55, 56};
 b[0][0] = 51 b[0][1] = 52 b[0][2] = 53
 Use braces to separate rows in 2-D arrays.
 int c[4][3] = {{1, 2, 3},
{4, 5, 6},
{7, 8, 9},
{10, 11, 12}};
 int c[ ][3] = {{1, 2, 3},
{4, 5, 6},
{7, 8, 9},
{10, 11, 12}};
Implicitly declares the number of rows to be 4.
INITIALIZATION

Input of Two-Dimensional Arrays
 Data may be input into two-dimensional
arrays using nested for loops interactively
or with data files.
 A nested for loop is used to input elemts in
a two dimensional array.
 In this way by increasing the index value of
the array the elements can be entered in a
2d array.

Output of Two-Dimensional Arrays
 The output of two-dimensional arrays should
be in the form of rows and columns for
readability. Nested for loops are used to print
the rows and columns in row and column
order.
 By increasing the index value of the array the
elements stored at that index value are printed
on the output screen.

A program to input elements in a
two dimensional array and print it.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3];
int i,j;
clrscr();
printf(“enter the elements in the array:”);

for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
scanf(“%d”,&a[i][j]);
}
}
for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
printf(“%d”,a[i][j]);
} printf(“n”);
}
getch();
}

OUTPUT :-
Enter elements in array:
1
2
3
4
5
6
7
8
9
123
456
789

Storage Allocation
In storage allocation of array contagious memory is
allocated to all the array elements.

EXAMPLES BASED ON
TWO-DIMENSIONAL
ARRAY

A program to add two matrix
entered by the user and print it.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3],b[3][3],c[3][3];
int i,j;
clrscr();
printf(“enter the elements in both the array:”);

for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
}
}
for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
scanf(“%d”,&b[i][j]);
}
}

for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
c[i][j]=a[i][j]+b[i][j];
printf(“%d”,c[i][j]);
}
printf(“n”);
}
getch();
}

OUTPUT:-
Enter elements in array:-
1 3
2 4
3 5
4 6
5 7
6 8
7 9
8 2 4 6
9 81012
1 141618
2

A program to input a matrix and
print its transpose.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3],b[3][3];
int i,j;
clrscr();
printf(“enter the elements in the array”);

for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
{
}
}
for(j=0 ; i<3 ; i++)
{
for(i=0 ; j<3 ; j++)
{
printf(“%2d”,&b[j][i]);
}
}
getch();
}

OUTPUT:-
Enter elements in array:
1
2
3
4
5
6
7
8
9
147
258
369

A program to multiply two matrix
entered by the user and print it.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3],b[3][3];
int i,j;
clrscr();
printf(“enter the elements in the array”);

for(i=0 ; i<3 ; i++)
{
for(j=0 ; j<3 ; j++)
c[i][j]=0;
{
for(k=0 ; k<2 ; k++)
{
c[i][j]=c[i][j]+a[i][k]*b[k][j]
printf(“%3d”,c[i][j]);
}
}
printf(“n”);
}
getch();
}

OUTPUT:-
Enter elements in array:-
1 3
2 4
3 5
4 6
5 7
6 8
7 9
8 30 66 102
9 36 81 121
1 42 96 150
2

Multidimensional array in C

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