Quiz: Integer numbers

Select all the examples with valid integer numbers.

1	`42`
1	`0`
1	`-42`
1	`+100`	You can add `+` if you want.
0	`3.14`	This is a valid number, but not an integer number.
1	`1000`
1	`1_000`
1	`10_000`
0	`10__000`	Two underscores are not allowed.
0	`_100`	A number cannot start with underscore.
0	`100_`	A number cannot end with underscore.
1	`1_0_0_0`	This is correct, but looks weird.
1	`10_00`	This is also correct, but it is not the best choice.
0	`50,000`	A comma does not split the number into thousands.
0	`45 678 901`	Spaces are not allowed inside numbers.

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