Question

Write output of the program

CLS
DIM N(3, 3)
FOR I = 1 TO 3
FOR J = 1 TO 3
READ N(I, J)
NEXT J
NEXT I
DATA 10,20,30,40,50,60,70,80,90
S-0
FOR I = 1 TO 3
FOR J = 1 TO 3
IF I = J THEN S = S + N(I, J)
NEXT J
NEXT I
PRINT S
END
​

Answer 1

N = [[10, 20, 30],

[40, 50, 60],

[70, 80, 90]]

S = 10 + 50 + 90 = 150

Step-by-step explanation:

This is a BASIC program that initializes a 3x3 array N with values from a DATA statement, calculates the sum of the diagonal elements of the array, and prints the result.

Here's the step-by-step execution of the program:

• The CLS command clears the screen.
• The DIM statement declares a 3x3 array N with 9 elements.
• The first nested FOR loop iterates over the rows and columns of the array, and the READ statement assigns each value from the DATA statement to the corresponding element of the array.
• The second nested FOR loop iterates over the rows and columns of the array again.
• The IF statement checks if the current row and column index are the same (i.e., the current element is on the diagonal of the array).
• If the current element is on the diagonal, the value of that element is added to the variable S.
• The PRINT statement outputs the value of S, which is the sum of the diagonal elements of the array.

The output of the program should be: 150