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Number
The following are numbers: 0 1 2 2.5 12.75 0.5 7e6
Enter these, and other numbers, in simple sentences with the verbs + - * and %.
2 * 12.75
25.5
An important rule is that a number does not start with a dot.
0.5
0.5
0.5 + 3
3.5
.5
+-+-+
|.|5|
+-+-+
.5 + 3
|syntax error
| .5+3
Clearly .5 is not the same as 0.5. You don't need to know now what .5 is yet, but it is important to understand that a number does not start with a dot.
The _ (underbar) is infinity and is a number.
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