Flags - HP 33s User Manual

Scientific
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Example:
The "Normal and Inverse–Normal Distributions" program in chapter 16 uses the
x y ? conditional in routine T:
Program Lines:
(In RPN mode)
.
.
.
 
  
 
 
  
  
  
  
.
.
. 
Line T0009 calculates the correction for X
value of the calculated correction with 0.0001. If the value is less than 0.0001
("Do If True"), the program executes line T0014; if the value is equal to or greater
than 0.0001, the program skips to line T0015.

Flags

A flag is an indicator of status. It is either set ( true ) or clear ( false ). Testing a flag is
another conditional test that follows the "Do if true" rule: program execution
proceeds directly if the tested flag is set, and skips one line if the flag is clear.
Meanings of Flags
The HP 33s has 12 flags, numbered 0 through 11. All flags can be set, cleared,
and tested from the keyboard or by a program instruction. The default state of all
12 flags is clear . The three–key memory clearing operation described in appendix
B clears all flags. Flags are not affected by
13–8
Programming Techniques
Calculates the correction for X
Adds the correction to yield a new X
Tests to see if the correction is significant.
Goes back to start of loop if correction is significant.
Continues if correction is not significant.
Displays the calculated value of X.
. Line T0013 compares the absolute
guess
¹ ¡
Description
.
guess
guess
{  } {  }.
.

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F2216a - 33s scientific calculator

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