1sizeof(double) is 8
2y is 1.000000
3y is 1.666667
4y is 2.333333
5y is 3.000000
6y is 3.666667
7y is 4.333333
8y is 5.000000
9y is 5.666667
10y is 6.333333
11y is 7.000000
12y is 7.666667
13y is 8.333333
14y is 9.000000
15y is 9.666667
16