Question

I want to concatenate two integers, that is not adding their values, but join them.

For example:

int a=2,b;
cin>>b;
a=a+3;

a should be something like 23 instead of 5.

How can I do that?

Answer 1

A simple method would be to multiply the number by 10 and then add the new integer.

Edit: Other answers were more accurate. In the case where a number can be above 10 you will need to either treat them as strings and then convert back to int (itoa on the c_str()). If you want to keep them as int, you will need to know which power of 10 contains your new value and multiply the number by this power of 10 to make enough room for the new number.