Grade-9 Ch-21: Array in QBAISC Lab

 Here are  practical questions on arrays in QBasic, covering both single-dimensional and multi-dimensional arrays, along with their solutions. These exercises are designed to help students understand and work with arrays effectively.

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1. Sum of Elements in a Single-Dimensional Array

Q: Write a QBasic program to input 5 numbers into a single-dimensional array and calculate their sum.

Solution:

DIM arr(5) AS INTEGER
sum = 0

FOR i = 1 TO 5
    INPUT "Enter a number: ", arr(i)
    sum = sum + arr(i)
NEXT i

PRINT "The sum of the elements is: "; sum

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2. Find the Largest Number in an Array

Q: Write a program to find the largest number in a single-dimensional array containing 10 elements.

Solution:

DIM arr(10) AS INTEGER
largest = -32768 ' Initialize with a very small value

FOR i = 1 TO 10
    INPUT "Enter a number: ", arr(i)
    IF arr(i) > largest THEN
        largest = arr(i)
    END IF
NEXT i

PRINT "The largest number is: "; largest

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3. Search for an Element in an Array

Q: Write a program to search for a specific number in an array of size 7. If found, display its position; otherwise, display a message saying it is not found.

Solution:

DIM arr(7) AS INTEGER
INPUT "Enter the number to search for: ", target
found = 0

FOR i = 1 TO 7
    INPUT "Enter a number: ", arr(i)
NEXT i

FOR i = 1 TO 7
    IF arr(i) = target THEN
        PRINT "Number found at position: "; i
        found = 1
        EXIT FOR
    END IF
NEXT i

IF found = 0 THEN
    PRINT "Number not found in the array."
END IF

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These exercises introduce students to key concepts in array operations, including initialization, traversal, searching, and two-dimensional array manipulations like transposing a matrix.