How to resolve the algorithm Empty string step by step in the Icon and Unicon programming language

Published on 12 May 2024 09:40 PM
#Icon and unicon

How to resolve the algorithm Empty string step by step in the Icon and Unicon programming language

Table of Contents

Problem Statement

Languages may have features for dealing specifically with empty strings (those containing no characters).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Empty string step by step in the Icon and Unicon programming language

Source code in the icon programming language

s := ""                 # null string
s := string('A'--'A')   # ... converted from cset difference 
s := char(0)[0:0]       # ... by slicing

s1 == ""                # lexical comparison, could convert s1 to string
s1 === ""               # comparison won't force conversion
*s1 = 0                 # zero length, however, *x is polymorphic 
*string(s1) = 0         # zero length string

s1 ~== ""               # non null strings comparisons 
s1 ~=== ""
*string(s1) ~= 0

s := &null              # NOT a null string, null type
/s                      # test for null type
\s                      # test for non-null type

You may also check:How to resolve the algorithm Identity matrix step by step in the Clio programming language
You may also check:How to resolve the algorithm Queue/Usage step by step in the App Inventor programming language
You may also check:How to resolve the algorithm Fibonacci n-step number sequences step by step in the Lua programming language
You may also check:How to resolve the algorithm Seven-sided dice from five-sided dice step by step in the Julia programming language
You may also check:How to resolve the algorithm Date format step by step in the Racket programming language