Consider the base address for array contains 20 elements into R0 register and place value 0 into it and then the next address is stored into R1 and the value 1 is placed into it. Then consider a loop using branch statements for 20 times by taking value 20 into any other register and decrement it until it reaches 0 in this way loop can be achieved. Loop statements will be considering R2 as the next address and placed with the value by adding R0 and R1 and then R1 address is given to R0, R2 address is given to R1 and then R2 address is incremented and executed for 20 times.

What does this look like as code?