Radio Shack TRS-80 PC-3

A$
C$
A string variable may be from 0 to 7 characters long. If you try to store more than 7 characters in a string variable, only the
first 7 will be saved. When a string variable is empty, or its length is zero, it is called NUL or the NUL string.
Numeric Array Variables
For some purposes it is useful to deal with numbers as an organized group, such as a list of scores or a tax table. In BASIC these
groups are called arrays. An array can be either one-dimensional, like a list, or two-dimensional, like a table. Array names are
designated in the same manner as simple variable names, except that they are followed by parentheses. The elements of an array
are referred to by a number inside the parentheses; when the array is two-dimensional, there must be two numbers separated by
a comma.
A(5)
B (3,2)
The fifth element of a one-dimensional array A.
The element in the third row and second column of a two dimensional B array.
Arrays are created using the DIM verb or command. To create an array, give its name and its size.
DIMX(5)
DIM Y(32)
Note that DIM X(5) actually creates an array with six entries:
Xl!)) X(1) X(2)
X(3)
X(4) X(5).
Similarly DIM Y(2, 2) creates an extra 0 row and an extra 0 column:
46