Question

Need help in LMC coding: Calculate the sum from 1 to a number inputted by users
For example, if user inputs 5, calculate 1+2+3+4+5 and output 15...

Answer 1

@KonradZuse @Callisto ?

Answer 2

I hv the flowchart idk how to convert into code?

Answer 3

You could start by choosing one symbol from the flowchart and code for it. Then do it again and again until you have all the symbols coded. Then you just have to "smooth out" the code between the symbols.

When in doubt, decompose (break down) the problem into smaller problems. Eventually a solution will appear.

Answer 4

@ParthKohli need help!!

Answer 5

inp
sto value
out
add N
brp value
sub value
out
bra value
add n
hlt
its not compiling.. >.<

Answer 6

INP
STA SUM
LOOP SUB ONE
STA TEMP
LDA SUM
ADD TEMP
STA SUM
LDA TEMP
BRZ QUIT
BRA LOOP
QUIT LDA SUM
OUT
HLT

ONE DAT 1
SUM DAT
TEMP DAT

Answer 7

thanks meepi, can u explains the branching part?

Answer 8

explain*

Answer 9

First we store the input in SUM
Then we substract 1 from the accumulator, and store the new number in TEMP
next we load SUM into the accumulator, and add TEMP and we store this in SUM again
then we load temp into the accumulator
BRZ check if temp is 0, in which case we're finished (5 + 4 + 3 + 2 + 1 + 0, we have the sum), and if it is we branch to QUIT
otherwise we use BRA to go back to the top of the loop and repeat the process

Answer 10

alright so u took temp as a variable to store the new #?

Answer 11

each iteration of the loop temp gets lowered by 1 and added to the sum in SUM
if temp is 0 we're done

temp is used as a countdown from input to 0, and each time the loop runs we add it to sum and substract 1 from it

Answer 12

got it now! thank you very much for your help! I appreciated!