Writing a while loop in vba

While Excel provides a plethora of built-in functions, especially so if you include functions in the Analysis Took Pack in Excelthe functions that used to be in the ATP are now native Excel functions you may find it useful to create your own custom function for things that Excel cannot easily do with the built-in functions. While it takes longer for Excel to calculate a VBA function than it does to calculate a worksheet formula, all else being equal, the flexibility of VBA often makes a VBA function the better choice. The rest of this page assumes that you are familiar with the basics of VBA programming. A UDF can only return a value to the cell s whence it was called -- it must not modify the contents or formatting of any cell and must not modify the operating environment of Excel.

Writing a while loop in vba

If condition is Nothing, Visual Basic treats it as False. One or more statements following While, which run every time condition is True. Transfers control to the next iteration of the While block. Transfers control out of the While block.

Terminates the definition of the While block. Remarks Use a While End While structure when you want to repeat a set of statements an indefinite number of times, as long as a condition remains True.

If you want more flexibility with where you test the condition or what result you test it for, you might prefer the Do If you want to repeat the statements a set number of times, the For Next Statement is usually a better choice.

Note The While keyword is also used in the Do If condition is True, all of the statements run until the End While statement is encountered. Control then returns to the While statement, and condition is again checked. If condition is still True, the process is repeated.

The While statement always checks the condition before it starts the loop.

writing a while loop in vba

Looping continues while the condition remains True. The condition usually results from a comparison of two values, but it can be any expression that evaluates to a Boolean Data Type value True or False. This expression can include a value of another data type, such as a numeric type, that has been converted to Boolean.

You can nest While loops by placing one loop within another. You can also nest different kinds of control structures within one another.

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For more information, see Nested Control Structures. Exit While immediately transfers control to the statement that follows the End While statement. You typically use Exit While after some condition is evaluated for example, in an If You might want to exit a loop if you detect a condition that makes it unnecessary or impossible to continue iterating, such as an erroneous value or a termination request.

You can use Exit While when you test for a condition that could cause an endless loop, which is a loop that could run an extremely large or even infinite number of times.

You can then use Exit While to escape the loop. You can place any number of Exit While statements anywhere in the While loop.

When used within nested While loops, Exit While transfers control out of the innermost loop and into the next higher level of nesting. The Continue While statement immediately transfers control to the next iteration of the loop.

For more information, see Continue Statement. Example In the following example, the statements in the loop continue to run until the index variable is greater than The OpenText method opens the file and returns a StreamReader that reads the characters.

In the While condition, the Peek method of the StreamReader determines whether the file contains additional characters.

Jun 03,  · Each pass through a Do Loop that iterates a specified number of times, requires you to also implement or decrement some sort of Loop Counter, while a For Next Loop does that work for you. Both Loops will provide the same results, but the For Next Loop is substantially faster. To test if it works press F5 while in the VBA editor, or ALT+F8 in Excel and run the “CompareWithForNextAndIfThen” macro (see Excel VBA Tutorial Chapter 3: Condition Statements, Command Button on how you can add a button to run a macro). WHILE is a loop (repetition) with a simple conditional test at its beginning. IF-THEN-ELSE is a decision (selection) in which a choice is made between two alternative courses of action. Although these constructs are sufficient, it is often useful to include three more constructs.

WriteLine "File Not Found: OpenText textFilePath While sr. ReadLine End While sr.Tagged excel vba book pdf, excel vba if then else, excel vba jobs salary, excel vba keycode, excel vba open workbook, excel vba question box, excel vba sort, excel vba while, excel vba while loop, excel vba xlup vs xldown Leave a comment.

Loop programming exercises and solutions in C June 20, Pankaj C programming C, Exercises, Loop, Programming In programming, there exists situations when you need to repeat single or a group of statements till some condition is met. Macros/Visual Basic for Applications (VBA) While the Macro Recorder is working, the Stop Macro button appears on your screen on its own toolbar.

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Writing Your Own Functions In VBA. This page describes how to write your own worksheet functions in VBA. While Excel provides a plethora of built-in functions, especially so if you include functions in the Analysis Took Pack (in Excel , the functions that used to be in the ATP are now native Excel functions) you may find it useful to create your own custom function for things that Excel.

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