samuel :
I try for an exercice to add
String nb = "135";
String nb2 = "135";
Result should be a String of "270"
I have no idea how to do that...I try to make a for loop and make an addition : nb.charAt(i) + nb2.charAt(i) but with no succes, I don't know what I have to do with the carry over.
EDIT : I try to don't use Integer or BigInteger, only String this is why I try to use a for loop.
Thanks for clue.
SHIVANSH NARAYAN :
String str = "";
// Calculate length of both String
int n1 = nb.length(), n2 = nb2.length();
int diff = n2 - n1;
// Initially take carry zero
int carry = 0;
// Traverse from end of both Strings
for (int i = n1 - 1; i>=0; i--)
{
// Do school mathematics, compute sum of
// current digits and carry
int sum = ((int)(nb.charAt(i)-'0') +
(int) nb2.charAt(i+diff)-'0') + carry);
str += (char)(sum % 10 + '0');
carry = sum / 10;
}
// Add remaining digits of nb2[]
for (int i = n2 - n1 - 1; i >= 0; i--)
{
int sum = ((int) nb2.charAt(i) - '0') + carry);
str += (char)(sum % 10 + '0');
carry = sum / 10;
}
// Add remaining carry
if (carry > 0)
str += (char)(carry + '0');
// reverse resultant String
return new StringBuilder(str).reverse().toString();
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