Texas Instruments TI-89 Titanium User Manual

Programming 624
Example 4
This example uses built-in functions to calculate the result without using a loop.
Ê
Prompts for input on Program I/O.
Ë Calculates sum.
Ì Displays output on Program I/O screen.
Note:
Because Input returns n as a number, you do not need to use expr to convert n.
Ê
Ë
Ì
:prog4()
:Prgm
:Input "Enter an integer",n
:sum(seq(i,i,1,n))!temp
:Disp temp
:EndPrgm
Function Used in this example to:
seq Generate the sequence of integers from 1 to n.
sum Sum the integers in the list generated by seq.
seq(expression, var, low, high [,step])
Ê expression used to generate the sequence
Ë variable that will be incremented
Ì initial and final values of var
Í
increment for var ; if omitted, uses 1
ÊËÌÌÍ

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches