The following operators may be used as part of expressions.
Arithmetic operators
The arithmetic operators take two numbers as operands.
| + | add | - | subtract | |
| * | multiply | / | divide | |
| ^ | raise to the power |
Relational operators
The relational operators can compare numbers, and return a logical value of FALSE=O and TRUE=-1.
| < | less than | = | equal to | |
| <= | less than or equal to | > | greater than | |
| <> | not equal to | >= | greater than or equal to |
Logical operators
The logical operators operate on numeric or logical values. Boolean FALSE is taken as zero, TRUE as —1.
Indirection operators
The following operators allow the programmer to access memory directly (called PEEK in other versions of BASIC) or to alter the contents of specified memory locations (called POKE in other BASICs).
...
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| vec?0 | vec?111 | vec?2 | vec?3 | vec?4 | vec?5 | vec?6 | vec?7 | vec?8 | vec?9 | vec?10 | vec?11 | vec?12 |
Note that ?vec is an alternative way of writing vec?0. A typical manipulation might be
...
Alternatively the vector could be addressed as 4 four-byte words:
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| vec?100 | vec?144 | vec?188 | vec?12 | |||||||||
Finally, the string indirection operator allows a string to be stored directly into an area of memory. For example:
...
Individual characters can be accessed with the ? operator.
Order of precedence
The order of precedence of the operators is as follows:
| Group 1 | - | unary minus | ||
| () | brackets | |||
| NOT | logical NOT | |||
| Group 2 | ^ | raise to the power | ||
| Group 3 | * | multiply | ||
| / | divide | |||
| Group 4 | + | add | ||
| - | subtract | |||
| Group 5 | < | less than | ||
| = | equal to | |||
| <= | less than or equal to | |||
| > | greater than | |||
| <> | not equal to | |||
| >= | greater than or equal to | |||
| Group 6 | AND | Logical AND | ||
| Group 7 | OR | Logical OR | ||
| EOR | Logical Exclusive-OR |
so, for example, A-B*CAD C^D is equivalent to A-(B*(CADC^D)).