Array addition, subtraction and multiplication

#! /bin/bash

echo  -n "Enter the size of the arrays: "
read n

echo -n "Enter the first array: "
read -a a
if [ ${#a[@]} -ne $n ]; then
    echo "Array not of specified length."
    exit 1
fi

echo -n "Enter the second array: "
read -a b
if [ ${#b[@]} -ne $n ]; then
    echo "Array not of specified length."
    exit 1
fi

for(( i=0; i<$n; i++ )){
    add[$i]=$((a[i]+b[i]));
    sub[$i]=$((a[i]-b[i]));
    mul[$i]=$((a[i]*b[i]));
}

echo "The addition array is "${add[*]}
echo "The subtraction array is "${sub[*]}
echo "The multiplication array is "${mul[*]}