Labeling Output with Tags

To label a result with a tag:

1.Put the output object on the stack.

2.Enter a tag — a string, a quoted name, or a number.

3.Enter the →TAG command (PRG TYPE menu).

«… object tag →TAG … »

→TAG takes two arguments — an object and a tag — from the stack and return a tagged object.

Example: The following program TTAG is identical to TINPUT, except that it returns the result as AREA: value.

Program:

Comments:

 

 

«

 

"Key in a, b"

 

{ ":a::b:" {1 0} V }

 

INPUT OBJ→

 

TORSA

 

"AREA"

Enters the tag (a string).

→TAG

Uses the program result

 

and string to create the

 

tagged object.

»

 

 

 

`OTTAG ‰

Stores the program in

TTAG.

 

 

 

Execute TTAG to calculate the area of a torus of inner radius a = 1.5 and outer radius b = 1.85. The answer is returned as a tagged object.

J%TTAG%1.5 ˜1.85 `

Labeling and Displaying Output as Strings

To label and display a result as a string:

1.Put the output object on the stack.

2.Enter the →STR command (PRG TYPE menu).

3.Enter a string to label the object (with "" delimiters).

4.Enter the SWAP + commands to swap and concatenate the strings.

5.Enter a number specifying the line to display the string on.

6.Enter the DISP command (PRG OUT menu).

«… object →STR label SWAP + line DISP … »

DISP displays a string without its "" delimiters.

1-50 RPL Programming