Yes, you can have negative and positive integers.
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To write -45 as a decimal, you simply write "-45.0" or "-45.00" to indicate the number includes a whole number and decimal point. The decimal form of -45 represents the same value as the integer -45, but with a decimal point to show its position on the number line. The negative sign indicates that the number is less than zero.
It is not an integer but is a rational number.
Every integer is.
There is no such number: every whole number is an integer.
For any integer, there is a whole number that is bigger, and for any whole number, there is a integer that is bigger.