# HP 48gII User Manual Page 712

Graphing calculator.

loop index that gets modified before the logical_statement is checked at
the beginning of the next repetition. Unlike the DO command, if the first
evaluation of logical_statement is false, the loop is never executed.
Example 1 – calculate the summation S using a WHILE...REPEAT...END
construct
The following program calculates the summation
Using a WHILE...REPEAT...END loop:
0. → n S
WHILE 'n≥0' REPEAT n SQ S + 'S' STO n 1 –
«
«
'n' STO END S "S" →TAG " "
Store this program in a variable @@S4@@. Verify the following exercises: J
3 @@@S4@@
Result: S:14
5 @@@S4@@
Result: S:55
10 @@@S4@@
Result: S:385
30 @@@S4@@
Result: S:9455
Example 2 – generate a list using a WHILE...REPEAT...END construct
Type in the following program
→ xs xe dx
xe xs – dx / ABS 1. + xs → n x
«
«
WHILE 'x<xe' REPEAT 'x+dx' EVAL DUP 'x' STO END n →LIST " "
"
and store it in variable @GLIS4.
Check out that the program call 0.5 ` 2.5 ` 0.5 ` @GLIS4
produces the list {0.5 1. 1.5 2. 2.5}.
To see step-by-step operation use the program DBUG for a short list, for
example:
n
2
S
=
k
k
=
0
4 @@@S4@@
8 @@@S4@@
20 @@@S4@@
100 @@@S4@@
Result: S:30
Result: S:204
Result: S:2870
Result: S:338350
«
xs
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