Write a python program with a loop that asks the user to enter a series of positive numbers. The user should enter a negative number to signal the end of the series. After all the positive numbers have been entered, the program should display their sum.

Input:

$1\mathrm{.}1$

$2\mathrm{.}2$

$3\mathrm{.}3$

$4\mathrm{.}4$

$5\mathrm{.}5$

$6\mathrm{.}6$

$7\mathrm{.}7$

$8\mathrm{.}8$

$9\mathrm{.}9$

$0$

Expected output:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Enter a positive number $($negative to quit$)$:

Total $=49\mathrm{.}50$