Adding Two Array in shell script

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# 1  
Old 08-20-2017
Adding Two Array in shell script

Hi Experts,

I've got this problem where I need to add two array in shell script such that that is an element is greater than 9 then it get further split into individual digit, something like below :
Input :-
array1=(2 6 8 9 10 12)
array2=(5 4 6 8 12 14)
Output :-
array3=(7 1 0 1 4 1 7 2 2 2 6)

Explanation :- 5+2 = 7   (less then 10 so no action required)
                    6+4 = 10 (greater then 9 so it gets split into 1,0)

Here is what I've tried to add two array which is working fine but not sure on how to split the number.
echo "Welcome to first array progg."
 declare -a arr1=(5 7 9 12 14 19)
 declare -a arr2=(7 4 3 8 12 17)
 declare -a arr3=()
 for ((i=0; i<$len; i++))
     sum=$(( ${arr1[$i]}+${arr2[$i]} )) 
     #echo $sum
     arr3=("${arr3[@]}" "$sum")
echo ${arr3[@]}
##Entry Point of the Progg.

# 2  
Old 08-20-2017
     sum=$(( ${arr1[$i]}+${arr2[$i]} ))       #echo $sum
     if [ $sum -gt 9 ]
       arr3=("${arr3[@]}" "$sum/10") #sum divided by 10
       arr3=("${arr3[@]}" "$sum%10") #mod 10 sum
       arr3=("${arr3[@}" "$sum")

I don't normally use bash or arrays, so I am sure of the syntax.
Will there be a possibility that the sum is greater than 99?
# 3  
Old 08-20-2017
How about
for i in ${!array1[@]}; do printf "%s" $((array1[i] + array2[i])); done | od -An -c
   7   1   0   1   4   1   7   2   2   2   6

Last edited by RudiC; 08-20-2017 at 12:17 PM..
This User Gave Thanks to RudiC For This Post:
# 4  
Old 08-23-2017
Thanks Rudic,

Can you please also explain the logic used in below part :
od -An -c

# 5  
Old 08-23-2017
man od:
-A, --address-radix=RADIX
output format for file offsets; RADIX is one of [doxn], for Decimal, Octal, Hex or None
-t, --format=TYPE
select output format or formats
-c same as -t c, select printable characters or backslash escapes
# 6  
Old 09-07-2017
Thanks Rudic,

Really liked the way you did it, very short and crisp. Just wondering if there is way to achieve it via sed or some other array operation.
# 7  
Old 09-07-2017
Why sed specifically? Is this homework?

Shell doesn't really have "array operations", just loops.
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