Q$3.[6$ marks$]$ Write a program which asks user to input an integer number between $0$ and $999$

$($inclusive$)$ and then prints the sum of all the digits of that integer number. For example, for

an integer number $346,$ the sum should be $3+4+6=13.$

Hint: You can use $"\%"$ and $"/"$ operators to extracts digits of that integer. For example, $346$

$\%10=6$ and $\frac{346}{10}=34.$

Sample run:

Enter an integer between $0$ and $999($inclusive$)$: $956$

The sum of all digits in $956$ is $20$