Tests Of Comparison (X?Y, X?0) - HP 33s User Manual

Flag tests. These check the status of flags, which can be either set or clear.
Loop counters. These are usually used to loop a specified number of times.

Tests of Comparison (x?y, x?0)

There are 12 comparisons available for programming. Pressing
º 
displays a menu for one of the two categories of tests:
x ? y for tests comparing x and y.
x ? 0 for tests comparing x and 0.
Remember that x refers to the number in the X–register, and y refers to the number
in the Y–register. These do not compare the variables X and Y.
Select the category of comparison, then press the menu key for the conditional
instruction you want.
If you execute a conditional test from the keyboard, the calculator will display 
or  .
For example, if x =2 and y =7, test x y .
In RPN mode
In ALG mode
The Test Menus
x ? y
y ?
{ } for x
{ } for x y ?
{ } for x y ?
{ } for x y ?
{ } for x y ?
{  } for x=y ?
Keys:
Ï ¹ ¬
7 2
w ¹ ¬
7 2
x ? 0
{ } for x 0 ?
{ } for x 0 ?
{ } for x 0 ?
{ } for x 0 ?
{ } for x 0 ?
{  } for x =0 ?
{ }

{ }

Programming Techniques
¹ ¬
or
Display:
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