₦airaland Forum

Kindly help me solve this BASIC programming questions:
10 LET K = 2
20 LET L = 9
30 LET SUM =0
40 FOR J = K TO STEP 2
50 SUM = SUM+ J^2
60 PRINT "ANSWER=", SUM
70 NEXT J
80 END

A. How many times will the statement lines 50 and 60 be repeated?
B. What is the best sequence of output for the program?
C. What is the last output to be displayed by the program?

walletxtra:
Kindly help me solve this BASIC programming questions:
10 LET K = 2
20 LET L = 9
30 LET SUM =0
40 FOR J = K TO STEP 2
50 SUM = SUM+ J^2
60 PRINT "ANSWER=", SUM
70 NEXT J
80 END

A. How many times will the statement lines 50 and 60 be repeated?
B. What is the best sequence of output for the program?
C. What is the last output to be displayed by the program?

Solutions :
A. I want to believe you omitted L after the TO in line 40,right? If so, statement lines 50 and 60 will be repeated four (4) times as the loop will only iterate 4 times since the loop counting variable J will have four values: 2,4,6 and 8

B. Best sequence of output for the program is by swapping the contents of statement lines 60 and 70. That way we only have one final value of SUM to be displayed as the output of the program, instead of four values as the program currently is.

C. Last output of the program is:
ANSWER= 120.
This is obtained this way:
For values of J= 2,4,6,8 in each iteration,
SUM =0 + 2^2 = 4 ----->1st iteration
SUM =4 + 4^2 = 20 ----->2nd iteration
SUM =20 + 6^2 = 56----->3rd iteration
Lastly, SUM =56 + 8^2 = 120 ----->4th iteration

Best of luck.

Thanks a bunch

walletxtra:
Thanks a bunch

You're welcome.