Why I can't do arithmetic operations in console input “cin”?

Question

I am a beginner to C++. I am having some trouble or doubt; The thing is, I am giving an arithmetic operation such as 2+2 in user input cin>> . But in return it gives output of 2!

Code:

#include "iostream"
using namespace std;
int main(){
    int t;
    cin>>t;      // Here I Have Given 2+2
    cout<<t;     // Instead of giving 4; It is giving me 2
    return 0;
}

Is There any solution to this? Please Help Me!

Answer 1

You declare t as an integer. You give "2+2" in input. That is no int, that's a string and cin reads the first integer from the input.

cin>>t;
cout<<t+t;

This would print 4. But the point here is that you can't assign arithmetic operations to cin. You need to create them in the code.