Texas Instruments TI-89 Manual Do Utilizador

Programming

 601

How Strings Are Used

How Strings Are Used

How Strings Are Used

How Strings Are Used

A string is a sequence of characters enclosed in "quotes." In programming, strings allow 
the program to display information or prompt the user to perform some action. For 
example:

Some input commands (such as 

) automatically store user input as a string and 

do not require the user to enter quotation marks.

A string cannot be evaluated mathematically, even if it appears to be a numeric 
expression. For example, the string "

61

" represents the characters "

6

" and "

1

", not the 

number 

61

.

Although you cannot use a string such as "

61

" or "

2x+4

" in a calculation, you can convert 

a string into a numeric expression by using the 

 command.

Disp "The result is",answer

– or –

Input "Enter the angle in degrees",ang1

– or –

"Enter the angle in degrees”

!

str1

Input str1,ang1