MetroCad USA

String Manipulation and Printing Functions

String Manipulation

(STRCAT <string1>.....<stringn>)

Combines all strings in order to create a single string. (strcat "Greg" "MacGeorge") retrurns "Greg MacGeorge" as a single string.

(STRLEN <string>)

Returns the number of characters in a string as an integer type. (strlen "macgeorge") returns 9.

(SUBSTR <string> <start-int> <length-int>)

Creates a substring of <string> starting at the <start-int> character position and continuing for <length-int> characters. The return is a string. <start-int> and <length-int> must be integers. The first character is number one. (substr "macgeorge" 4 6) returns "george".

(STRCASE <string> [<which>])

Converts all characters in <string> to upper or lower case. If <which> is non-nil, the conversion of <string> is to all lower case. If <which> is nil, or not present, the conversion of <string> is to all upper case characters. (strcase "macgeorge") returns "MACGEORGE" (strcase "MacGeorge" T) returns "macgeorge"

String Printing

(PROMPT <string>)

Displays <string> statement in the screen prompt area and returns nil. (prompt "Please enter a number") returns "Please enter a number" in the screeen prompt area on the command line.

(PRINC <expr> [<filedesc>])

Prints and returns the value of <expr> to the screen area. <expr> can be of any Data Type and can be symbols or variables. The value of a variable is displayed. If [<filedesc>] is present and the file is open for writing output is written to the file. A variable named txt3 has a value of 25.60. (princ txt3) returns 25.60 to the screen area (command line). (princ txt3 file1) returns 25.60 to the screen and writes 25.60 to file1.

(PRIN1 <expr> [<filedesc>])

This works the same as PRINC however, control codes are not interpreted. A variable named txt3 has a value of 25.60. (prin1 txt3) returns 25.60 to the screen area (command line). (prin1 txt3 file1) returns 25.60 to the screen and writes 25.60 to file1.

Example functions page

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