cin , a

[hooshdar3]

Hello
What does the line
cin, a;
do in the program:

#include <iostream>
using namespace std;
int main()
{
   int a = 0, b = 0;
   cin , a;
   cout << a<<' ' << b ;
   
    for(int i =9;i<300000000;++i);
    return 0;
}

Thanks in advance!

[firedraco]

It evaluates both sides of the operator, then returns the right hand side.