A MARIE program to evaluate the expression AxB + CxD are shown below:

ORG 100
Load  A
Store X      /Store A in first parameter
Load  B
Store Y      /Store B in second parameter
JnS    Mul   /Jump to multiplication subroutine
Load  Sum          /Get result
Store E      /E:= A x B
Load  C
Store X      /Store C in first parameter
Load  D
Store Y      /Store D in second parameter
JnS   Mul   /Jump to multiplication subroutine
Load  Sum          /Get result
Store F      /F := C x D
Load  E      /Get first result
Add   F      /AC now contains sum of A X B + C X D
Halt           /Terminate program
A,      Dec ?         /Initial values of A,B,C,D not given in problem
B,      Dec ?         / (give values before assembling and running)
C,      Dec ?         /
D,     Dec ? /
X,      Dec 0         /First parameter
Y,      Dec 0         /Second parameter
Ctr,   Dec 0         /Counter for looping
One, Dec 1         /Constant with value 1
E,      Dec 0         /Temp storage
F,      Dec 0         /Temp storage
Sum, Dec 0
Mul,   Hex 0         /Store return address here
Load Y               /Load second parameter to be used as counter
Store Ctr            /Store as counter
Clear                           /Clear sum
Store Sum          /Zero out the sum to begin
Loop, Load Sum /Load the sum
Add   X               /Add first parameter
Store Sum          /Store result in Sum

           Load  Ctr
           Subt  One          /Decrement counter
           Store Ctr            /Store counter
           Skip  Cond 400   /If counter = 0 finish subroutine
           Jump Loop          /Continue subroutine loop
           JumpI Mul           /Done with subroutine, return to main
           END