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 :
Code:
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.
Code:
#!/bin/bash
welcome()
{
echo "Welcome to first array progg."
}
main_logic()
{
 declare -a arr1=(5 7 9 12 14 19)
 declare -a arr2=(7 4 3 8 12 17)
 declare -a arr3=()
 sum=0
 len=${#arr1[@]}
 for ((i=0; i<$len; i++))
 do
     sum=$(( ${arr1[$i]}+${arr2[$i]} )) 
     #echo $sum
     arr3=("${arr3[@]}" "$sum")
 done 
echo ${arr3[@]}
}
##Entry Point of the Progg.
welcome
main_logic

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

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
Code:
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 :
Code:
od -An -c

# 5  
Old 08-23-2017
man od:
Quote:
-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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