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Concatenation is how you join strings together, generally using the & sign It is extremely useful when you want to display messages Suppose you are writing a program to display the number of tables in a database Your program counts up the tables and stores the number in a variable You could easily display the variable to the user, but what would it mean to that user When writing software, you want a clear message displayed to the user, such as, There are n tables within the database You do this by concatenating the string "There are", the variable n (which contains the number of databases), and the string "tables within the database" You can also introduce code that changes the first string to read There is when n has a value of 1, so that it is always grammatically correct
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MsgBox "There are " & n & " tables within the database "
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Consider the simple example of a ForNext loop from the section titled Looping in 4 The code is as follows:
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For n = 1 to 5 MsgBox n Next n
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The message box gives the value of n as it increments, but it is just a message box with a number and does not give the number any meaning By adding a string, you can make a more user-friendly message:
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For n = 1 to 5 MsgBox "The value of n is " & n Next n
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The message box will now show the text The value of n is 1 This will be displayed five times in all with the value of n incrementing each time Don t forget to leave a space after the word is, or your message will look peculiar and may be difficult to read There is no limit to how many strings and values you can concatenate in this way Note that, although n is numeric, VBA automatically turns it into a character string for concatenation
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You may need only a part of a string in your code For example, say you have a two-figure reference number at the beginning of the string that you need to use elsewhere in your program, but you wish to show only the name:
"12Richard"
To pull out the name only, you can use the Mid function:
x=Mid("12Richard",3)
5: Strings, Functions, and Message Boxes
This code will start at the third character and continue to the end of the string and place the result in the variable x, which will then contain the string "Richard" The Mid function has an optional length parameter so that you can specify the length of your substring If you leave this out, you will get everything from your start point to the end of the string Note that in all these situations you can also use a variable that contains a string:
temp="12Richard" x=Mid(temp,3)
You can also use this function to extract the number portion of the string at the front:
x=Mid("12Richard",1,2)
This code will start at the first character and take the next two characters from the string and place them in the variable x, which will contain a string with the value of 12, although this is not actually a number but a string VBA is quite forgiving if you want to do further calculations with this, you do not need to change it back to a number However, if you are putting it back into a field in a table, you may need to change it to a number from a formatting point of view You do this by using the Val function:
Dim iValue as Integer iValue = Val("12")
The variable iValue will then be an actual number rather than a string VBA also includes Right and Left string functions The Left function can also be used to separate the number 12:
x=Left("12Richard",2)
The variable x will have the value 12 If the Right function is used, x will have the value rd:
x=Right("12Richard",2)
The Left and Right functions grab from the side of the string, as indicated by the function name VBA also contains functions to change the case of a string, as discussed next
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