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We may have certain cases where we would like to skip the iteration or stop all further iterations and move ahead in the program.

`break`

and `continue`

statements help us fulfill that purpose as well. In the last exercise, we returned the sum of all integers up to the number passed to the function as an argument. Suppose, if we would like to calculate the sum of all numbers input by the user. In this case,

If we take the input one by one, we can give the option to the user to end the process when he/she is done with inputting all the numbers.

```
total = 0
while True:
n = input("Enter 1 to enter a number, Enter 2 to stop the process\n")
if n is "1":
number = input("Enter the number\n")
try:
total = total + int(number)
except:
print("Please enter a valid number\n")
continue
elif n is "2":
break
else:
print("Please enter a valid choice\n")
continue
```

Here, we initialized the `total`

as `0`

and then there is a `while`

statement whose condition will always be `True`

(infinite loop). We give the option to the user at every iteration, whether to enter a new number or to stop entering the numbers.

If the user enters `1`

, we ask to enter the number. We take the precaution using `try`

`except`

statements to check whether the input given by the user is a valid number or not. If it is a valid number we add it to the sum, else we ask to enter a valid number. The `continue`

stops that iteration there and goes to the next iteration.

If the user enters `2`

we use `break`

statement to stop the complete loop and the flow goes out.

If the user enters anything other than given choices we ask to enter a valid choice.

- Remember whatever input we take from the user, it is in
`str`

format, `break`

and`continue`

process on the innermost loops in case of nested loops.

- Define a function with the name
`special_func`

which takes an argument`num`

- Initialize a variable
`total`

with value`0`

- Check if
`num`

is positive`int`

. If

`num`

is positive int, find out all the factors of that number and return the sum of odd factors i.e.`total`

of all factors which are**odd**. (Factors are the numbers you multiply together to get the number equal to`num`

). For example, the factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. Out of which only 1 and 3 are odd , So the`total`

(sum of odd factors) here should be '4'if

`num`

is negative or if the type of`num`

is not`int`

then return`-10`

.

**Sample Input:**

`special_func(12)`

`special_func(15)`

`special_func(-1)`

`special_func('abcd')`

**Sample Output:**

`4`

`24`

`-10`

`-10`

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