Texas Instruments 83CML/ILI/U Guidebook - Page 76

TEST LOGIC (Boolean) Operations TEST LOGIC Menu To display the TEST LOGIC menu, press y ãTESTä ~. This operator... TEST LOGIC 1: and 2: or 3: xor 4: not( Returns a 1 (true) if... Both values are nonzero (true). At least one value is nonzero (true). Only one value is zero (false). The value is zero (false). Boolean Operators Boolean operators are often used in programs to control program flow and in graphing to control the graph of the function over specific values. Values are interpreted as zero (false) or nonzero (true). and, or, xor not( and, or, and xor (exclusive or) return a value of 1 if an expression is true or 0 if an expression is false, according to the table below. valueA and valueB can be real numbers, expressions, or lists. valueA and valueB valueA or valueB valueA xor valueB valueA valueB and or xor ƒ0 ƒ0 returns 1 1 0 ƒ0 0 returns 0 1 1 0 ƒ0 returns 0 1 1 0 0 returns 0 0 0 not( returns 1 if value (which can be an expression) is 0. not(value) Using Boolean Operations Boolean logic is often used with relational tests. In the following program, the instructions store 4 into C. 2-26 Math, Angle, and Test Operations