adding the big Integer

#include $$iostream$>$ #include $$string$>$ using namespace std;

string addInteger $($string a$,$ string b$)\{$

int lengthA $=$ a$.$ length$()$;

int lengthB $=$ b$.$ length$()$;

$//$ insert code here

return result;

int main$()\{$

char num$1[100]$; char num$2[100]$;

cout $<$ "Enter two large integer:" $$ endl; cin $>$ num $$ num$2$;

cout $<<$ addinteger $$numl$,$ num$2$endl$$

return $0$;

$\}$