One Line of Input to Multiple Variables

I'm trying to take one line of input separated by spaces and assign it to four variables.

I read that you're meant to be able to do:

For input: 12345 string 4 5    
cin >> i >> s >> n1 >> n2;
i = 12345, s = string, n1 = 4, n2 = 5

But I have to press enter for each variable. I need one line to assign to the four variables.

Thanks.