How to compare 2 integers to see if they are equal?

Question

How do I compare two integers in C++?

---

I have a user input ID (which is int) and then I have a Contact ID that is part of my Struct. The Contact ID is int also.

I need to compare to see if they are the same, to know that it exists.

I did something like this*:

if(user_input_id.compare(p->id)==0) 
{
}

but I get an error message saying that expression must have class type.

*based on reading this page http://www.cplusplus.com/reference/string/string/compare/

Answer 1

The function you found is for comparing two std::strings. You don't have std::strings, you have ints. To test if two ints are equal, you just use == like so:

if (user_input_id == p->id) {
  // ...
}

In fact, even if you had two std::strings, you'd most likely want to use == there too.