Nota Bene: The TI 83/84 uses any nonzero number to represent true (most often it is 1) and zero to represent false.
Test Conditions
Test Conditions are used to compare different values and form the basis of Conditional Functions.
Equal
=, TEST:TEST:1 returns true if two input values are equal and false if not equal.
Syntax
:''Value 1'' = ''Value 2''
- Where Value 1 and Value 2 are both variables of the same type.
Example
PROGRAM:TEMP :0→X :If X=0 :Disp "True"
prgmTEMP True
Not Equal
≠, TEST:TEST:2 returns true if two input values are not equal and false if they are equal.
Syntax and Example
See Equal
Greater Than
>, TEST:TEST:3 returns true if first input value is larger than second input value and false if it is less than or equal.
Syntax and Example
See Equal
Greater Than or Equal To
≥, TEST:TEST:4 returns true if the first input value is larger than or equal to the second value and false if it is greater than.
Syntax and Example
See Equal
Less Than
<, TEST:TEST:5 returns true if the first input value is smaller than the second and returns false if it is greater than or equal to.
Syntax and Example
See Equal
Less Than or Equal To
≤, TEST:TEST:6 returns true if the first input value is smaller than or equal to the second input value and returns false if it is greater than.
Syntax and Example
See Equal
Logical Operators
Logical Operators help combine multiple boolean valued statements into one.
And
In order for an "and" conditional function evaluate to true, both parts of the statement have to be true or else it returns false.
Syntax
and, TEST:LOGIC:1
:''Boolean 1'' and ''Boolean 2''
- Where Boolean 1 and Boolean 2 are both expressions that can be evaluated to true or false.
Example
PROGRAM:TEMP :0→X :1→Y :If X=0 and Y=1 :Disp "TRUE"
prgmTEMP TRUE
Or
In order for an "or" conditional function to evaluate to true, at least one of the parts of the statement have to be true or else it returns false.
Syntax and Example
or, TEST:LOGIC:2
See And
XOr
In order for an "xor" conditional function to evaluate to true, exactly one of the values has to be true. If both of the values are true or false it evaluates to false.
Syntax and Example
xor, TEST:LOGIC:3
See And
Not
The "not" operator is a little different from the others, it only takes one value and it evaluates to the opposite.
Syntax
not(, TEST:LOGIC:4
:not(''valueA'')
- valueA can be almost anything. It can be a single number since numbers represent true and false, or it can be a boolean expression that evaluates to true or false.
Example
PROGRAM:TEMP :0→X :If not(X≠0) :Disp "X DOES NOT NOT EQUAL ZERO"
prgmTEMP X DOES NOT NOT EQUAL ZERO