HP 33s - Manual (Page 171)

Simple Programming 12–13
For example, see the " Coordinate Transformations" program in chapter 15.
Routine D collects all the necessary input for the variables M, N, and T (lines
D0002 through D0004) that define the x and y coordinates and angle
θ
of a new
system.
To respond to a prompt:
When you run the program, it will stop at each INPUT and prompt you for that
variable, such as @
)
. The value displayed (and the contents of the
X–register) will be the current contents of R.
„ To leave the number unchanged, just press g .
„ To change the number, type the new number and press g . This new
number writes over the old value in the X–register. You can enter a number as
a fraction if you want. If you need to calculate a number, use normal
keyboard calculations, then press
g . For example, you can press 2
‘ 5
g .
„ To calculate with the displayed number, press ‘ before
typing another number.
„ To cancel the INPUT prompt, press ‡ . The current value for the
variable remains in the X–register. If you press g to resume the program,
the canceled INPUT prompt is repeated. If you press ‡ during digit entry, it
clears the number to zero. Press ‡ again to cancel the INPUT prompt.
Using VIEW for Displaying Data
The programmed VIEW instruction ( | Š variable ) stops a running
program and displays and identifies the contents of the given variable, such as
/
) 
This is a display only, and does not copy the number to the X–register. If
Fraction–display mode is active, the value is displayed as a fraction.
„ Pressing ‘ copies this number to the X–register.
„ If the number is wider than 14 characters, pressing |  displays
the entire number. (If it is a binary number with more than 12 digits, use the
˜ and — keys to see the rest.)
„ Pressing ‡ (or b ) erases the VIEW display and shows the X–register.