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The Logic of Looping Control Structures
(For/Next, Do While, Do Until, etc.)
FOR, DO UNTIL,
DO WHILE, etc.
(Are the circum-
stancesmet?)
stances met?)
Yes
Execute the
statements between
b i i
d
beginning and
nd
end of loop
No
End of loop (NEXT,
END, etc.)
Continue the rest of the program
© 2010 S. Malpezzi
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For Next
=1to10
For x   1 to 10
 10
Beep
Next x
•Use For Next when you know exactly how many times to run 
the loop when you start.
•If you don’t know this, use a Do Loop.
© 2010 S. Malpezzi
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Do While ... Loop
oop
x = 0
Do While x < 10
Beep
x = x + 1
Loop
•Use Do While ... Loop when you want to test a condition 
before you run the loop and then continue to run the loop 
while the condition is true.
© 2010 S. Malpezzi
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Do Until ... Loop
oop
x = 0
Do Until x > 10
Beep
x = x + 1
Loop
•Use Do Until ... Loop when you want to test a condition at the 
p
y
beginning of the loop and and then run the loop until the 
condition is true.
NB: If the condition is true to begin with, the statements in the 
 in the 
 
loop are not executed!
•Suppose we changed code above to “Do Until x < 10”
© 2010 S. Malpezzi
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If... Then... Else ...
...
•Single‐line syntax:
If x < 3 Then y = 0
•Block syntax:
If x < 3 Then
y = 0
z = x + 1
End If
•If, Then, Else:
If x < 3 Then
y = 0
y
Else
y = 1
End If
f
© 2010 S. Malpezzi
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The Logic of IF/THEN Control Structures
IF Statement
(Is the condtion true?)
Yes
Execute the
statements between
No
IF and END IF
END IF
Continue the rest of the program
© 2010 S. Malpezzi
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Elseif, and Select Case
ase
•Suppose you have more than two alternatives to evaluate in an “If... 
Then...” situation
on
–e.g. if you have several income classes, need to calculate taxes 
differently for each class
•You can “nest” If... Then... Else... statements (doable, but hard to follow.
 to follow.
ow.
•You can use If... Then... Elseif
If inc < 10000 then tax = inc * .2
Elseif inc < 20000 then tax = inc * .3
* .3
3
Elseif inc < 30000 then tax = inc * .4
Else tax = inc * .5
End If
© 2010 S. Malpezzi
Select Case
e
•Select Case is similar to If... Then... Elseif
Select Case inc
Case 0 to 10000
tax = inc * .2
.2
Case 10001 to 20000
* 3
tax = inc   .3
.3
Case 20001 to 30000
tax = inc * .4
Case Else
tax = inc * .5
End If
f
© 2010 S. Malpezzi
Functions
•Macros (subroutines) can be called in several ways, for 
example:
–“Tools,” “Macro,” then select
Install buttons in worksheet or on toolbar
oolbar
–Macros can call other macros
•Macros don’t pass arguments when called (except when a 
macro calls another macro)
•Functions, in contrast, are always called from within a cell; 
nd one or more arguments are usually passed.
 passed.
a do e o
oea gu e tsa eusua ypassed
•Functions always return a value to the cell containing them.
–Example:  =SUM(1,2,3) returns the value 6 to the cell 
containing the formula.
ula.
.
© 2010 S. Malpezzi
Functions
•Microsoft provides a large set of pre‐written
Microsoft provides a large set of pre written 
ritten 
 
functions (SUM, IRR, NPV, AVERAGE, and so on), but 
we can write our own.
•We’ll write one today:
Compute internal rate of return for a series of 
p
cash flows
U•nlike Excel’s, our IRR function won’t quit till it 
solves.
It• isn’t as efficient, and hasn’t been thoroughly 
tested yet.
© 2010 S. Malpezzi
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