"Type mismatch" Runtime Error - Assignments to Array Variables

This section describes how values from scalar array variables can be assigned to other scalar or array variables. Runtime error 'Type mismatch' happens when you try to assign scalar values or arrays to array variables.

After learning two types of variables: scalar variable and array variable, let's review and summarize how assignment operation works with both types in this section.

1. Can you assign the value of a scalar variable to another scalar variable? The answer is simple: "Yes". For example:

   another_scalar_variable = scalar_variable

2. Can you assign the value of a scalar variable to an array variable? The answer is simple: "No". For example:

   array_variable = scalar_variable

3. Can you assign the value of an array variable to a scalar variable? The answer is not so simple.

Technically, a scalar variable is not capable to store an array. So the answer is no - you can not assign an array directly to a scalar variable.

But a scalar variable can be used to store a reference, or a pointer, of an array. So the answer is yes - you can assign an array indirectly to a scalar variable. For example:

   scalar_variable = array_variable

4. Can you assign the value of an array variable to another array variable? The answer is simple: "No". For example:

   another_array_variable = array_variable

Try to play with the following example to understand how assignment operation works with scalar variables and array variables:

<html>
<body>
<!-- array_type_mismatch.html
 - Copyright (c) 2015, HerongYang.com, All Rights Reserved.
-->
<pre>
<script language="vbscript">
   Dim aScalar
   Dim anotherScalar
   Dim anArray(9)
   Dim anotherArray(9)
   
   anotherScalar = aScalar 'Creates a copy of aScalar's value
   anArray = aScalar       'Runtime error: Type mismatch
   aScalar = anArray       'Creates a copy of anArray's array
   anotherArray = anArray  'Runtime error: Type mismatch
</script>
</pre>
</body>
</html>

Table of Contents

 About This Book

 Introduction of VBScript - Visual Basic Scripting Edition

 Variant Data Type, Subtypes, and Literals

 Arithmetic Operations

 Numeric Comparison Operations and Logical Operations

 String Operations - Concatenation and Comparison

 Variable Declaration and Assignment Statement

 Expression and Order of Operation Precedence

 Statement Syntax and Statement Types

 Array Data Type and Related Statements

Array References and Array Assignment Statements

 Assigning an Array to a Scalar Variable

 Array References Work Like Arrays

 "Array()" Function - Returning a Scalar Reference of an Array

 Creating a Copy of an Array

"Type mismatch" Runtime Error - Assignments to Array Variables

 Conditional Statements - "If ... Then" and "Select Case"

 Loop Statements - "For", "While", and "Do"

 "Function" and "Sub" Procedures

 Built-in Functions

 Inspecting Variables Received in Procedures

 Error Handling Flag and the "Err" Object

 Regular Expression Pattern Match and Replacement

 scrrun.dll - Scripting Runtime DLL Library

 Creating Your Own Classes

 IE Web Browser Supporting VBScript

 IIS ASP Server Supporting VBScript

 WSH (Windows Script Host)

 References

 PDF Printing Version