Sums and comparisons

Arithmetic

PRINT 7 + 2, 7 - 2, 7 * 2
PRINT 7 / 2           // dividing always gives a fraction
PRINT 7 \ 2           // a backslash divides and keeps the whole part
PRINT 7 MOD 2         // what's left over
PRINT 2 ^ 10          // to the power of
PRINT SQRT(16), INT(3.9), ABS(-5), MIN(4, 2, 8), MAX(4, 2, 8)

9 5 14
3.5
3
1
1024
4.0 3 5 2 8

From BASIC: These are the ones you know: \, MOD and ^.

From Python: \ is your //, MOD is your %, and ^ is your **.

From JavaScript: ^ is a power here, and your XOR is ~. MOD is your %.

From Lua: \ is your // and MOD is your %.

Comparing

One = does both jobs. At the start of a line it gives a variable a value. Anywhere else it asks whether two things are equal.

score = 10
PRINT score = 10, score <> 10
PRINT score > 5, score >= 10, score < 5, score <= 9
PRINT "apple" < "banana"

1 0
1 1 0 0
1

A comparison gives 1 for yes and 0 for no.

From Python, JavaScript and Lua: There’s no ==. Equal is = and not equal is <>.

AND, OR, NOT

They’re words. 0 and NULL count as no; other numbers count as yes.

lives = 3
shield = FALSE
PRINT lives > 0 AND NOT shield
PRINT lives = 0 OR shield
PRINT NOT NULL

1
0
1

From BASIC: AND, OR and NOT work on yes and no here. The bit operators are below.

From JavaScript: AND and OR give 1 or 0. They don’t hand back one of their two values, so name OR "nobody" won’t give you a default.

From Lua: The same goes for you: x OR y gives 1 or 0.

Bits

When you need them, they’re symbols: & and, | or, ~ exclusive or (and, with one value, not), << and >> to shift.

flags = 0b1010
PRINT flags & 0b0110, flags | 1, flags ~ 0b1111
PRINT 1 << 4, 256 >> 2, ~0

2 11 5
16 64 -1