Write a MIPS code to compute the sum of N numbers such that each sum skips over

Question

Write a MIPS code to compute the sum of N numbers such that each sum skips over certain numbers. Ask the user for how many numbers to skip (give option of 1-4) and then proceed to compute the sum.

Sum(x1) = N1 + N2 + N3 + …

Sum(x2) = N1 + N3 + N5 + ….

Sum(x3) = N1 + N4 + N7 + ….

Sum(x4) = N1 + N5 + N9 + ….

Sum(x1) determines the sum of all numbers; Sum(x2) determines the sum of numbers skipped by 2, Sum(x3) determines the sum of numbers skipped by 3 and so on. Assume the numbers as given below where N1 = 100, N2 = -7, N3 = 25, N4 = -66 and so on.

________________________________________________________________

.data

.strA:   .asciiz “Please enter your choice to skip numbers (1-4) ”

Numbers: .byte 100, -7, 11, 25, -66, 99, -1, 34, 12, 22, -2, -7, 100, 11, 4, 67, 2, -90, 22, 2, 56, 3, -89, 12, -10, 21, 10, -25, -6, 9, 111, 34, 12, 22, -2, -17, 100, 111, -4, 7, 14, -19, -2, 29, 36, 31, -79, 2

.globl main

.text

main: # Commented Program Starts Here

Explanation / Answer

Let Register 1 cntain the sum.
Let Register 2 contain the next number that we need to add
Let Register 3 be the flag which will keep a count till 'n'\1.

1) SUM(X1)

begin:
  addi $1, $0, 0 # setting the sum as 0
  addi $2, $0, 1 # starting with 1
loop:
  slt $3, $4, $2 # checking if number is less than n
  bne $3, $0, Ecit if greater than n
  add $1, $1, $2 # Keep updating the sum
  addi $2, $2, 1 # setting the next NUMBER to add
  j loop # Looping the Process
finish: add $2, $1, $0 # Our FInal Result

2) SUM(X2)

begin:
  addi $1, $0, 0 # setting the sum as 0
  addi $2, $0, 1 # starting with 1
loop:
  slt $3, $4, $2 # checking if number is less than n
  bne $3, $0, Ecit if greater than n
  add $1, $1, $2 # Keep updating the sum
  addi $2, $2, 2 # setting the next NUMBER to add
  j loop # Looping the Process
finish: add $2, $1, $0 # Our FInal Result

3) SUM(X3)

begin:
  addi $1, $0, 0 # setting the sum as 0
  addi $2, $0, 1 # starting with 1
loop:
  slt $3, $4, $2 # checking if number is less than n
  bne $3, $0, Ecit if greater than n
  add $1, $1, $2 # Keep updating the sum
  addi $2, $2, 3 # setting the next NUMBER to add
  j loop # Looping the Process
finish: add $2, $1, $0 # Our FInal Result

4) SUM(X4)

begin:
  addi $1, $0, 0 # setting the sum as 0
  addi $2, $0, 1 # starting with 1
loop:
  slt $3, $4, $2 # checking if number is less than n
  bne $3, $0, Ecit if greater than n
  add $1, $1, $2 # Keep updating the sum
  addi $2, $2, 4 # setting the next NUMBER to add
  j loop # Looping the Process
finish: add $2, $1, $0 # Our FInal Result

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