multiplying in string code example
Example: multiply strings
string Solution::multiply(string A, string B)
{
vector<int> arr(A.size()+B.size(),0);
for(int i=A.size()-1;i>=0;i--)
{
for(int j =B.size()-1;j>=0;j--)
{
int x = (B[j]-'0')*(A[i]-'0')+arr[i+j+1];
arr[i+j+1] = x%10;
arr[i+j] += x/10;
}
}
int i=0;
while(i<arr.size())
{
if(arr[i]!=0)
break;
i++;
}
if(i == arr.size())
return "0";
string s = "";
for(int j=i;j<arr.size();j++)
s += to_string(arr[j]);
return s;
}