Question

Write a MARIE program that sums the numbers from 1 to N (N(N + 1) / 2) using a loop and user input.

Answer 1

`Hey,

Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries

    INPUT           /Read a number n. where n stores inot AC
   JNS FindSum          /Call FindSum by passing n
   OUTPUT               /Print the return value(sum)
   HALT           /Exit the program
FindSum, HEX 000             /Store the return address
   STORE n              /Save the passed value into n
LOOP,   SKIPCOND 800             /if n is 0, go to Return
   JUMP Return      
   /Do sum=sum+n
   LOAD sum             /AC=sum
   ADD n                /AC=sum+n
   STORE sum            /sum=AC
   /DO n=n-1
   LOAD n               /AC=n
   SUBT ONE             /AC=n-1
   STORE n              /n=AC
   JUMP LOOP            /Go to LOOP
Return, LOAD sum             /Send sum as return value
   JUMPI FindSum       /Return from FindSum
/Declare necessary variables
n,    DEC 0
sum, DEC 0
ONE, DEC 1

Below is the process to run it

Open MARIE Simulator

Open File editor

Write the program

Save the program as sumoneton.mas

Assemble the program

Now load the program(sumoneton.max)

Note: Set INPUT ,AC and OUTPUT display format as Dec (Decimal number)

Run the program

Input: enter n=5

Ouptut: sum=1+2+3+4+5= 15

Kindly revert for any queries

Thanks.