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Testing is the process of evaluating a system or its component(s) with the intent to find whether it satisfies the specified requirements or not.
Testing is executing a system in order to identify any gaps, errors, or missing requirements in contrary to the actual requirements.
This tutorial will give you a basic understanding on software testing, its types, methods, levels, and other related terminologies.
This tutorial is designed for software testing professionals who would like to understand the Testing Framework in detail along with its types, methods, and levels. This tutorial provides enough ingredients to start with the software testing process from where you can take yourself to higher levels of expertise.
Before proceeding with this tutorial, you should have a basic understanding of the software development life cycle (SDLC). In addition, you should have a basic understanding of software programming using any programming language.

Description

Each of these functions, referred to collectively as the IS functions, checks the specified value and returns TRUE or FALSE depending on the outcome. For example, the ISBLANK function returns the logical value TRUE if the value argument is a reference to an empty cell; otherwise it returns FALSE.

You can use an IS function to get information about a value before performing a calculation or other action with it. For example, you can use the ISERROR function in conjunction with the IF function to perform a different action if an error occurs:

=IF(ISERROR(A1), 'An error occurred.', A1 * 2)

Primary function of lan

This formula checks to see if an error condition exists in A1. If so, the IF function returns the message 'An error occurred.' If no error exists, the IF function performs the calculation A1*2.

Syntax

ISBLANK(value)

ISERR(value)

ISERROR(value)

ISLOGICAL(value)

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Function Of Lan Tester

ISNA(value)

ISNONTEXT(value)

ISNUMBER(value)

4 What Is The Function Of Lan Metering Software Testing

ISREF(value)

ISTEXT(value)

The IS function syntax has the following argument:

Function
Returns TRUE if
ISBLANK
Value refers to an empty cell.
ISERR
Value refers to any error value except #N/A.
ISERROR
Value refers to any error value (#N/A, #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, or #NULL!).
ISLOGICAL
Value refers to a logical value.
ISNA
Value refers to the #N/A (value not available) error value.
ISNONTEXT
Value refers to any item that is not text. (Note that this function returns TRUE if the value refers to a blank cell.)
ISNUMBER
Value refers to a number.
ISREF
Value refers to a reference.
ISTEXT
Value refers to text.

Remarks

4 What Is The Function Of Lan Metering Software Testing Center

Examples

Example 1

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

Formula
Description
Result
=ISLOGICAL(TRUE)
Checks whether TRUE is a logical value
TRUE
=ISLOGICAL('TRUE')
Checks whether 'TRUE' is a logical value
FALSE
=ISNUMBER(4)
Checks whether 4 is a number
TRUE
=ISREF(G8)
Checks whether G8 is a valid reference
TRUE
=ISREF(XYZ1)
Checks whether XYZ1 is a valid reference
FALSE

Example 2

Function Of Lan

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

4 What Is The Function Of Lan Metering Software Testing Tool

Data
Gold
Region1
#REF!
330.92
#N/A
Formula
Description
Result
=ISBLANK(A2)
Checks whether cell A2 is blank.
FALSE
=ISERROR(A4)
Checks whether the value in cell A4, #REF!, is an error.
TRUE
=ISNA(A4)
Checks whether the value in cell A4, #REF!, is the #N/A error.
FALSE
=ISNA(A6)
Checks whether the value in cell A6, #N/A, is the #N/A error.
TRUE
=ISERR(A6)
Checks whether the value in cell A6, #N/A, is an error.
FALSE
=ISNUMBER(A5)
Checks whether the value in cell A5, 330.92, is a number.
TRUE
=ISTEXT(A3)
Checks whether the value in cell A3, Region1, is text.
TRUE