Texas Instruments TITANIUM TI-89 User Manual

Page 640

Programming

640

Example 4

This example uses built-in functions to calculate the result without using a loop.

Prompts for input on Program I/O.

Calculates sum.

Displays output on Program I/O screen.

Note:

Because

Input

returns

as a number, you do not need to use

expr

to convert

: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

]

)

expression used to generate the sequence

variable that will be incremented

initial and final values of

var

increment for var ; if omitted, uses 1

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