{

int len1 = str1.size();

int len2 = str2.size();

if (len1 < len2)

{

for (int i = 0 ; i < len2 - len1 ; i++)

str1 = '0' + str1;

return len2;

}

else if (len1 > len2)

{

for (int i = 0 ; i < len1 - len2 ; i++)

str2 = '0' + str2;

}

return len1;

{

string result;

int length = makeEqualLength(first, second);

int carry = 0;

for (int i = length-1 ; i >= 0 ; i--)

{

int firstBit = first.at(i) - '0';

int secondBit = second.at(i) - '0';

int sum = (firstBit ^ secondBit ^ carry)+'0';

result = (char)sum + result;

carry = (firstBit & secondBit) | (secondBit & carry) | (firstBit & carry);

}

if (carry)

result = '1' + result;

return result;

{

string str1 = "1100011";

string str2 = "10";

cout << "Sum is " << addBitStrings(str1, str2);

return 0;