Now, which of these variables store numbers?

double d = 3.1416;int i = 42;string s = "815";string s = 815;

Sweet! int-type variables are whole numbers and double-type variables can have decimal places. "815" is a string and we can't assign numbers to strings.

Yikes! int-type variables are whole numbers and double-type variables can have decimal places. "815" is a string and we can't assign numbers to strings.