QUESTIION $14$

Using a looping structure, prompt user for positive double values from the keyboard. Ignore all negative value After the loop ends, print the total of the read integers.

Example:

Enter a double number.

$-1\mathrm{.}1$

Invalid input, try again

Enter a double number:

$0$

Invalid input, try again

Enter a double number:

$2\mathrm{.}122222$