2. Modify sum.s to find the sum of all positive numbers in the array. You need to test the program with some negative numbers in the array.

## sum.s - print sum of array elements. ##

## Assumes the array has at least two elements (a[0]

## and a[1]). It initializes both min and max to a[0]

## and then goes through the loop count-1 times.

## This program will use pointers. ##

## t0 - points to array elements in turn

## t1 - contains count of elements

## t2 - contains sum

## t3 - each word from array in turn

##

################################################# # # # text segment # # # #################################################

.text main: la $t0,array # $t0 will point to the array lw $t1,count # exit loop when $t1 is 0 li $t2,0 # initialize t2 as 0, t2 to hold the sum loop: lw $t3,0($t0) # load next word from array add $t2,$t2,$t3 # sum=sum + array[i] add $t1,$t1,-1 # decrement counter add $t0,$t0,4 # increment pointer by word bne $t1,$zero,loop # and continue if counter>0

la $a0,ans li $v0,4 syscall # print "sum = "

move $a0,$t2 li $v0,1 syscall la $a0,endl # system call to print li $v0,4 # out a newline syscall

li $v0,10 syscall # au revoir...

################################################# # # # data segment # # # #################################################

.data

array: .word 3,4,2,6

count: .word 4

endl: .asciiz " "

ans: .asciiz "sum = "

## ## end of file sum.s