input multiple times throughout the program

Question

Why we cannot assign two values to two int variables with just only one cin and the cout part also, like the code showed below
#include <iostream>
using namespace std;

int main()
{
int a,b;
cout << "Please enter 2 number"<<endl;
cin>>a,b;
cout<<a,b;
return 0;
}

Answer 1

Try using
cin>>a>>b;
cout<<a<<b;

Answer 2

Why we cannot assign two values to two int variables with just one in like that:
in a b

why??? please sign a petition to change the language please🙏