basic.scan Function/BASIC Program


Command basic.scan Function/BASIC Program
Applicable release versions: AP 6.2, R91
Category BASIC Program (486)
Description searches through a given "string.expression" for the first occurrence of up to three user-definable character(s) specified by "search.delimeter(s)" in addition to the system delimeters: subvalue, value, and attribute. If the delimeter is found, "scan" returns the numeric position at which the occurence was found. The user-defined characters must be separated by a system delimeter (' " ).

If the specified search delimeters or any system delimeters are not found, "0" (zero) is returned.
Syntax scan(string.expression, search.delimeter(s))
d.position = scan(The "first" or 'second' 

This returns the value, "5", to the variable "d.position", 
since the first occurrence of either ' or " is found in the fifth 
position of the string. 

on scan("abcdefg","c":VM:"e":VM:"g") 
goto 10,20,30,40,50,60,70

This example exploits the fact that "scan" returns a number 
indicating the position of the search character. For instance, if "c" 
is found then it will goto statement label 30.

 input ans,1
 until scan('abc',ans) do repeat

If "ans" is either an a, b, or c, the loop is terminated.  Notice 
that a null value for "ans" results in a "0" from the 
"scan" function.
Related basic.statements