Debugging a Program
A program might generate an error message or unexpected results when it is executed. This indicates that there is an error in the program that needs to be corrected.
•Error messages appear for approximately 5 seconds, and then the cursor blinks at the location of the error.
•To correct an error, select EDIT from the program menu.
•You also can select TRACE from the program menu. The program is then checked
Using the Graph Function in Programs
Using the graph function within programs enables you to graphically illustrate long or complex equations and to overwrite graphs repeatedly. All graph commands (except trace and zoom) can be included in programs. Range values can also be specified in the program.
Note that values in some graph commands must be separated by commas (，) as follows:
•Range ( Xmin, Xmax, Xscl, Ymin, Ymax, Yscl )
•Factor ( Xfact, Yfact )
•Plot ( X point, Y point )
Display Result Command
You can put 
in a program if you want to be able to see the value of a variable at that particular stage in program execution.
For example:
Line 1: INPUT A ; B = ln ( A + 100 )
Line 2: C = 13 × A ; 
Line 3: D = 51 / ( A × B )
Line 4:PRINT ” D = ”, D ; END
1.Execution is interrupted at the point where you placed 
.
2.At this time, you can press [ 2nd ] [ RCL ] to view the value of the corresponding memory variable (C in the above example).
3.To resume program execution, press [
].
Deleting a Program
1.Select DEL from the program menu and press [
].
2.To erase a single program, select ONE, the program area you want to
erase, and then press [
]