task1.txt

#!/bin/bash
echo "Numarul de argumente este $#."

re='^[+-]?[0-9]+([.][0-9]+)?$'
suma=0
for number do
	if [[ $number =~ $re ]] ; then
		w=0         # Hamming weight (count of bits that are 1)
		n=$number   # work on $n to save $number for later

		# test the last bit of the number, and right-shift once
		# repeat until number is zero
		while (( n > 0 )); do
		    if (( (n & 1) == 1 )); then
		        # last bit was 1, count it
		        w=$(( w + 1 ))
		    fi

		    if (( w > 1 )); then
		        # early bail-out: not a power of 2
		        break
		    fi

		    # right-shift number
		    n=$(( n >> 1 ))
		done

		if (( w == 1 )); then
		    # this was a power of 2
		    printf '%d\n' "$number"
		fi

	   suma=$((suma+$number))
	fi
done
echo "Suma numerelor este $suma."