This document discusses one and two dimensional arrays in Visual Basic. It includes examples of declaring and initializing one and two dimensional arrays, using nested loops to iterate through elements in two dimensional arrays, and self-test questions involving manipulating elements in arrays and matrices using loops. Examples are provided for initializing arrays to zero, filling arrays with values, accessing row and column lengths, summing elements in rows and matrices, and copying/separating arrays.

1. one & two dimensional arrays CLASS ACTVITY SELF TEST
LOOP:
You can use it for one-dimensional array, for either row or
column.
Dim a(2) AS Integer
Use loop to initialize all
locations to zero (0)
– Declare 2 dimensional integer array but not initialized:
Dim a(,) As Integer
– Declare 3 dimensional integer array but not initialized:
Dim b(,,) As Integer
– In the following example you need to perform two steps
to create an array declare and Initialize.
– Declare and initialize two-dimensional integer array
Dim c(2,1) As Integer
c(0,0) = 33
c(0,1) = 71
c(1,0) = -16
c(1,1) = 45
c(2,0) = 99
c(2,1) = -27
In two-dimensional array, you can use the following
command to get the length of row and column.
For rows c.GetUpperBound(0)
For columns c.GetUpperBound(1)
NESTED LOOP (loop within a loop)
You can use it for two-dimensional array. In Visual Basic,
you can declare arrays with up to 32 dimensions.
The following statement declares a two-dimensional array
of 3 rows and 3 columns.
Dim a(2,2) As Integer
1st loop for row,
2nd loop for column
For row = 0 to 2
For col = 0 to 2
0 1 2
0
1
2
Q1: Initialize with "0" the two-dim array using nested loop
Q2: Fill the two-dimensional array using nested loop
0 1 2
0 0 1 1
1 1 0 1
2 1 1 0
Q3: Fill the two-dimensional array with the following
pattern using nested loop
0 1 2
0 1 1 0
1 1 0 1
2 0 1 1
Try yourself Homework ( ‫م‬‫س‬‫ق‬‫آ‬, NO COPY)
Q4: Write a code to count the total number of even
and odd elements in an array {8, 9, 22, 25, 26}
0
1
2
0 1 2

2. one & two dimensional arrays CLASS ACTVITY SELF TEST
Q5: write a program to add 2 one-dimensional
arrays.
{8,7,3,5} + {1,2,7,10} = {9,9,10,15}
Q6: write a program to find sum of each row of a
matrix (Hint: use nested loop)
10 15 20 45
15 20 30 = 65
20 10 40 70
Q7: write a program to print the sum of the
following matrix (Hint: use nested loop)
Q8: Write a program to copy all elements from an
array to another array.
Q9: Write a program to put even and odd elements
of array in two separate array.
Q10: Write a program to find sum of each row and
column of a matrix.
Q11: Write a program that asks the user to type 10
integers of an array. The program must compute
and write how many integers are greater than or
equal to 10.
Q12: Challenge: Write a program to multiply the
following 2 matrices (Hint: use 3 nested loop)
Input
Processing
Output
1 2
3 4
4 3
5 6
1x4 +2x5 1x3 +2x6
3x4 +4x5 3x3 +4x6
14 15
32 33
4 5 6
7 4 1
6 5 3
=+
x ==
1 1 1
2 2 2
3 3 3
5 6 7
9 6 3
9 8 6