126  Section 8: Programming Basics 
 
 
File name: HP 12c Pt Converted_user's guide_English_HDP0F123E02_080207  Page: 271 of 281   
Printed Date:  {  2007/8/2Dimension: 14.8 cm x 21 cm 
 
Keystrokes Display   
t
 
137.70 
TAX for third item. 
t
 
2,177.70 
TOTAL for third item. 
5
\
345 
345. 
Fourth item. 
t
 
1,725.00 
AMOUNT for fourth item. 
t
 
116.44 
TAX for fourth item. 
t
 
1,841.44 
TOTAL for fourth item. 
:
1 
5,967.70 
Sum of AMOUNT column. 
:
2 
402.82 
Sum of TAX column. 
:
3 
6,370.52 
Sum of TOTAL column. 
Program execution is also automatically halted when the calculator overflows (refer 
to page 89) or attempts an improper operation that results in an 
Error
 display. 
Either of these conditions signifies that the program itself probably contains an 
error. 
To determine at which program line execution has halted (in order to locate the 
error), press any key to clear the 
Error
 display, then press 
fs
 to set the 
calculator to Program mode and display that program line. 
You may also want to display the current program line (by pressing 
fs
) if 
your program has halted at one of several 
t
 instructions in your program and 
you want to determine which one that is. To continue executing the program 
afterward: 
1. Press fs to set the calculator back to Run mode. 
2.  If you want to resume execution from the program line at which execution 
halted rather than from line 000, press gi followed by three digit keys 
that specify the program line desired. 
3. Press t to resume execution. 
Stopping Program Execution Manually.
 Pressing any key while a program 
is running halts program execution. You may want to do this if the calculated 
results displayed by a running program appear to be incorrect (indicating that the 
program itself is incorrect). 
To halt program execution during a pause in a running program (that is, when 
gu
 is executed), press any key. 
After stopping program execution manually, you can determine at which program 
line execution has halted and/or resume program execution as described above.